Statistics question and answers for July 14, 2023
- Q An investigation of the effectiveness of a training program toimprove customer relationships included a pre-training andpost-training customer survey, 12 customers were randomly selectedto score the customer relationships both before and...
- Q 3. Consider the following statements about the Fdistribution:(i). One characteristic of the F distribution is that Fstatistics cannot be negative.(ii). There is one unique F distribution for a F-statistic with29...
- Q A local retail business wishes to determine if there is adifference in the mean preferred indoor temperature between men andwomen. Assume that the population standard deviations of preferredtemperatures are equal...
- Q A local retail business wishes to determine if there is adifference in the mean preferred indoor temperature between men andwomen. Assume that the population standard deviations of preferredtemperatures are equal...
- Q TechX have received complaints of excessive packaging of one oftheir products.  To test whether new minimalist packagingis preferred and whether the proportion of people who prefer thenew packaging is different for...
- Q 1-Find the z-score for which 70% of the distribution's area liesto its right.A. - 0.98B. - 0.47C. - 0.81D. - 0.532-Find the z-scores for which 98% of the distribution's area...
- Q 2) I am about to choose an integer, at random, from amongst thefollowing positive integers: {1,2,3,4, …., 25, 26, 27}a) is this an example of discrete or continuous uniformprobability distribution?...
- Q Thirty small communities in Connecticut (population near 10,000each) gave an average of x = 138.5 reported cases oflarceny per year. Assume that σ is known to be 40.3casesper year.(a) Find...
- Q Of 150 adults who tried a new cranberry-flavored peppermintpatty, 90 rated it excellent. Of 250 children sampled, 190 rated itexcellent. Use the 0.03 level of significance. Regarding whetherthere is a...
- Q A worker is engaged in the sale of programmed businessintelligence and has to choose Among the following options:Monthly base salary of $ 3,000 plus 5% commission on sales madeduring the...
- Q In testing a certain kind or truck tire over rugged​ terrain, itis found that 40​% of the trucks fail to complete the test runwithout a blowout. Of the next 12...
- Q TRUE OR FALSE : The residual is the difference between theactual value of a dependent variable and the value predicted by theestimated regression line.
- Q The joint pmf of ? and ? is given by ??,? (?, ?) = (? + ?)/ 27??? ? = 0, 1,2; ? = 1, 2, 3, and ??,? (?,...
- Q 1- The number of calories in a hamburgerdepends on what ingredients are included. The following aredeterminations of calorific values of a sample of homemade largehamburgers:350 375 400 356 378 379...
- Q (Please solve manually.)Â Â Every April Americans andCanadians fill out their tax return forms. Many turn to taxpreparation companies to do this tedious job. The question arises,Are there differences between companies? In...
- Q Total Cholestrol Level (mg/dL)192191184189186194224233209280267233184237246193198199219180275240198225193247206211206230234209216230243232235255191204241188230189189248207256243186203213205217228190271181195196215202194225197231227202246200222229198234280239232247222202225294229223264218202249221228208195249202230210232196205209Mean= 219.27Standard Deviation= 24.9591use this sapke data, contruct a 98% confidebce interval fortotal cholestrol level for all patient.construct 90% interval for totla cholesterol level for allpatients. then...
- Q 1. The data below show the volume of transactions​ (in hundredsof​ thousands) in shares of a corporation over a period of 12weeks. Using these​ data, estimate a​ first-order autoregressive​model, and...
- Q Folder on Blackboard contains information on the hourly wages inpounds of a sample of young Scottish workers aged 20-24.Use thesedata to answer the following nine questions.For numerical questions provide your...
- Q 1. The General Social Survey (2008) asked a random sample ofpeople whether they agree with the following statement: A husband’sjob is to earn money; a wife’s job is to take...
- Q The mean annual income for people in a certain city (inthousands of dollars) is 42, with a standard deviation of 30. Apollster draws a sample of 92 people to interview.A)...
- Q The following datawere collected in an experiment designed to investigate the impactof different positions of the mother during ultrasound on fetalheart rate. Fetal heart rate is measured by ultrasound in...
- Q The overhead reach distances of adult females are normallydistributed with a mean of 195 cm and a standard deviation of 7.8cm. a. Find the probability that an individual distance is...
- Q Find the ‘best fit’ equation of net income for last year on lastyear’s sales. Test the significance of the overall model at 1%level of significance.CompanyMarket valueSalesProfitsAssetsRecent share priceP-E RatioYield14292696632446.61108638182.6723155737799975.03887047333.7631914372301093.5959059182.85499154908737.61942946166.6659094989267.7120330370.006720613428952.41118967081.72771645814319.4566268222.96863403962478.91257829154.87949963525183.1398733271.92104211370256.8407033743.301140414102282.35086354172.23123789161979.2149087480.321337448311194.0545860193.161436183832128.0276935200.001532003434190.0748329215.541631672330146.1245858222.431727593472138.63175205190.491826361172172.7645527153.31192567385891.4318819363.202024166895115.6181221220.002123001553202.3480227136.232222061739139.6300533160.61232012337665.2299434311.182420101773133.8685918240.00251994338928.0326643662.6426170764429.484541580.982716125550120.7316234134.71281404505107.1227327145.77291318215299.0200828142.12301285122064.792013201.853112812867112.61592528113.6732126157760.562834210.0033125384084.91362638210.743412161386102.61684438133.73351066221939.1166221271.76361060265053.7147935201.4737103421910.625030570.0038102181934.3156637280.00391011335254.4131921200.004095652842.543827222.484183296669.718443892.864282446155.450224150.004380588316.149535470.004478860039.758431220.654569238926.649730250.004663370835.8102024205.454761652640.947527162.124860235150.7391648123.604958545327.133144230.635058170539.447220153.16Find the...
- Q I need clear steps / formulas used with (F) ( I'm lost withcurrent solutions )To get full marks for the following questions you need toconvert the question from words to...
- Q A study of the effect of television commercials on 12-year-oldchildren measured their attention span, in seconds. The commercialswere for clothes, food, and toys.ClothesFoodToys3746592370453647473558532847633142531734483143582057474751445154Complete the ANOVA table. Use 0.05 significance level....
- Q In a test given to two groups of students to marks were asfollows:First group: 9, 11, 13, 11, 15, 9, 12, 14Second group: 10, 12, 10, 14, 9, 8, 10Examine...
- Q Describe the difference you would expect to see in the values ofthe mean and median fora normal distribution, a positively skewed distribution, and anegatively skeweddistribution.
- Q A study of the effect of television commercials on 12-year-oldchildren measured their attention span, in seconds. The commercialswere for clothes, food, and toys.ClothesFoodToys4330522438584246433554492847633142531734483143582057474751445154Complete the ANOVA table. Use 0.05 significance level.(Round...
- Q Use the following information for questions 1-5.Do larger families spend more per week on food? A sample of 10families in Chicago revealed the following data for family size andthe weekly...
- Q Men’s heights are normally distributed with a mean of 72 inchesand a standard deviation of 3.1 inches. A social organization forshort people has a requirement that men must be at...
- Q Bloomberg Media Group reported the result of an internet surveyof 1000 New Yorkers.The key question asked was: \"Should a wealth tax be levied to payfor humanitarian relief efforts?\". The results...
- Q A researcher fails to find a significant difference in meanblood pressure in 36 matched pairs. The test was carried out with apower of 85%. Assuming that this study was well...
- Q Isabel Myers was a pioneer in the study of personality types. Ina random sample of 62professional actors, it was found that 39 were extroverts.(a) Let p represent the proportion of...
- Q Consider a portfolio investment consisting of 40%invested in MTN, 60% invested in MultichoiceAdditional information:Expected return:MTN : -0,001986441Multichoice: 0,0032559323.1 Calculate the expected return of theportfolio3.2 Calculate the covariance of the portfolio3.3...
- Q The number of hours per week that high school seniors spend oncomputers is normally distributed with a mean of 5 hours and astandard deviation of 2 hours. 70 students are...
- Q For a pair of dice, if the discrete random variable isdefined by χ= {â–ˆ(1 if a=b@maxâ¡(a,b)if a≠b)┤(i) Determine the χ; χ(S) (ii) Construct the probabilitydistribution table of χ;f(xi) (iii) Find...
- Q A consumer advocacy group suspects that a local supermarket’s10 ounce packages of cheddar cheese actually weighs less than 10ounces. The group took a random sample of 20 such packages andfound...
- Q Hypothesis test for M&Ms:This section will work through constructing and interpreting ahypothesis test forproportions. You can find the information for constructing ahypothesis test insection 10.2. We will be using the...
- Q A random sample of n1 = 283 votersregistered in the state of California showed that 140 voted in thelast general election. A random sample of n2 =217 registered voters in...
- Q Would you favor spending more federal tax money on the arts? Ofa random sample of n1 = 95 politicallyconservative voters, r1 = 16 responded yes.Another random sample of n2 =...
- Q Unfortunately, arsenic occurs naturally in some ground water†. Amean arsenic level of μ = 8.0 parts per billion (ppb) isconsidered safe for agricultural use. A well in Texas is used...
- Q A random sample of n1 = 16 communities inwestern Kansas gave the following information for people under 25years of age.x1: Rate of hay fever per 1000population for people under 25100921221299412311293125951251179712212788A...
- Q Let x be a random variable that represents hemoglobincount (HC) in grams per 100 milliliters of whole blood. Thenx has a distribution that is approximately normal, withpopulation mean of about...
- Q he body temperatures of a group of healthy adults have a​bell-shaped distribution with a mean of98.21degrees°Fand a standard deviation of0.66 degrees°F.Using the empirical​ rule, find each approximate percentagebelow.a.Whatis the approximate...
- Q ) Ben and Allison each decide to wager 1 unit againstthe other person on flipsof an unfair coin, with probability 0.6 of landing head, until oneof them runs out of...
- Q 13. A large software development firm recently relocated itsfacilities. Top management is interested in fostering goodrelations with its new local community and has encouraged itsprofessional employees to engage in local...
- Q In the following problem, check that it is appropriate to usethe normal approximation to the binomial. Then use the normaldistribution to estimate the requested probabilities.It is estimated that 3.5% of...
- Q Question 1: A mobile phone manufacturer claims that thebatteries in the manufactured mobile phones are used for an averageof 140 hours after being charged once. For this purpose, 17telephone batteries...
- Q Linear regressionHelloWhat does it mean that the residuals in linear regression isnormal distributed? Why is it only the residuals that is, and notthe \"raw\" data? And why do we want...
- Q The purpose of this assignment is to apply a waiting line modelto a business service operation in order to recommend the mostefficient use of time and resources. (This assignment has...
- Q 6. Enthalpy is a measure of total energy in a thermodynamicsystem. The following table presents enthalpy measurements on 16water based systems. Four measurements are made on each of foursystems which...
- Q Case 7.2Skyhigh AirlinesSkyhigh Airlines flight 708 from New York to Los Angeles is apopular flight that isusually sold out. Unfortunately, some ticketed passengers changetheir plans at the lastminute and cancel...
- Q Consider a regression modelYi=β0+β1Xi+uiand suppose from a sample of 10 observations you are provided thefollowing information:∑10i=1Yi=71;  ∑10i=1Xi=42;  ∑10i=1XiYi=308;∑10i=1X2i=196Given this information, what is the predicted value ofY, i.e.,Yˆ for x = 12?1. 142....
- Q Let X has the probability density function (pdf)f(x)={C1, if 0 < x ≤ 1,C2x, if1<x≤4,0, otherwise.Assume that the mean E(X) = 2.57.(a) Find the normalizing constants C1 and C2.(b) Find...
- Q 1).A box contains 20 balls. Five are blue, seven are red, andeight are black. Four balls are selected at random and withreplacement. Calculate the probability that fewer than two redballs...
- Q what is the bais when paietns choose their medicne in thestudy?
- Q Explain the concept and purpose of z-scores and calculate themfor the performance of the following set of portfolio managers.PortfolioPortfolio PerformanceManager(AnnualisedReturnZ2%W11%T-4%S5%
- Q P(H)=2/3,P(T)=1/3, a coin  is thrown 3times,X is arandom variable that shows the number of getting heada) find the distribution of Xb)find the expected value of Xc) find the variannce of Xd)find...
- Q 19. An aircraft manufacturer requires bolts that are part of thelanding gear assembly to have a mean diameter of 1.1 inches with avariance of no more than 0.04 inches2. The...
- Q Box X contains 3 red, 2 white marbles; box Y contqains red,white marbles A box os selected at random; a marble is drawn andput into the other box; then a...
- Q A hotel chain wanted to learn about the level of experience ofits general managers. A random sample of 14 general managers wastaken, and these managers had a mean of 11.72...
- Q Blair & Rosen, Inc. (B&R) is a brokerage firm thatspecializes in investment portfolios designed to meet the specificrisk tolerances of its clients. A client who contacted B&R thispast week has...
- Q Given two independent random samples with the followingresults:n1=8 x‾1=109 s1=35 n2=12 x‾2=145 s2=20Use this data to find the 98% confidence interval for the truedifference between the population means. Assume that the...
- Q Hypothesis Testing. Follow the description of the assignmentbelow.Think of a problem of your interest, set up H0 and Ha andconduct the hypothesis test.Describe the research problem. Determine the level ofsignificance...
- Q WGG1M2M7F4M12F2M1M10F1M2M3M1M1M2M1MAssume that :The first column is the weight gain of the people in thequarantine in the first week in kilogram (WG) .  The second column is describing the gender whetherit...
- Q Refer to the accompanying data set of mean drive-through servicetimes at dinner in seconds at two fast food restaurants. Constructa 99% confidence interval estimate of the mean drive-throughservice time for...
- Q Use the sample data and confidence level given below to completeparts​ (a) through​ (d). In a study of cell phone use and brainhemispheric​ dominance, an Internet survey was​ e-mailed to...
- Q The following dataset contains a random sample of lifetime of120 BMW Xenon headlight bulbs. The manufacturer of these bulbswants to know whether it can claim that the bulbs last more...
- Q The mean of the binomial distribution 10âˆx ( 2/3 )^x ( 1/3 ) ^10 -x is given by
- Q Each of three supermarket chains in the Denver area claims tohave the lowest overall prices. As part of an investigative studyon supermarket advertising, a local television station conducted astudy by...
- Q Let X be from a normal distribution with mean u and varince 4.We would like to test the null hypothesis H0: u=10 against thealternative hypothesis H1: u>10. Let the rejection...
- Q Three-circle, red-on-white is one distinctive pattern painted onceramic vessels of the Anasazi period found at an archaeologicalsite. At one excavation, a sample of 173 potsherds indicated that64 were of the...
- Q A researcher wishes to investigate the idea that eating sea saltraises blood pressure less than eating normal table salt. Herandomly selects two groups, each with 13 people. He arranges thatGroup...
- Q In each of the following exercises, formulate an appropriatenull hypothesis and perform a test of that null hypothesis at the5% and 1% signiï¬cance levels. Use a one-sided or two-sided test...
- Q Central Tendency and Variation Activity1. Roll 4 dice 40 times, recording the sum for each roll.  Do it again so you have two groups of 40 numbers2. Calculate the mean, median,...
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