Statistics question and answers for July 24, 2023
- Q 1. In the iris data, build a linear regression model to predictSepal.Length based on both Petal.Length and Species.a. Calculate the regression equation, including theinteraction.b. From this equation, you should be...
- Q Using the naïve method (most recent value) as the forecast forthe next year, what are the following measures of forecastaccuracy1) Mean absolute error2) Mean squared error3) Mean absolute percentage error4)...
- Q The following sample data reflect shipments received by a largefirm from three different vendors and the quality of thoseshipments. (You may find it useful to reference the appropriatetable: chi-square table...
- Q The effect of phosphate supplementation on bone formation wasassessed in six healthy adult dogs. For each dog, bone formationwas measured for a 12-week period of phosphate supplementation aswell as for...
- Q would like you to imagine that you have a black bag full of 20marbles. All the marbles contained in the bag are the same size,and texture. The marbles in the...
- Q Data were collected on number of credit hours earned from arandom sample of 40 JMU students. The mean was 57.2 and thestandard deviation was 8.9. Conduct a test to determine...
- Q A normal population has a mean of 58 and a standard deviation of13. You select a random sample of 25.Round to 4 decimal places.a.34% of the time, the sample average...
- Q Invest in science ~ The Pew Research Centerconducted a survey of U.S. adults in 2019 to determine how Americancitizens feel about whether federal government should increasespending for scientific research. In...
- Q 7. When you submit your tax return to the IRS,they screen your return for indications of fraud. Naturally thescreening system is not perfect: only 92% of fraudulent tax returnsget red-flagged...
- Q In a study investigating the difference in food preferencesbetween men and women, researchers asked subjects to indicatewhether they like or disliked certain foods. One question was aboutlamb. Twenty percent of...
- Q \"A producer of various feed additives for cattle conducts astudy of the number of days of feedlot time required to bring beefcattle to market weight. Eighteen steers of essentially identi-...
- Q how does sampling variation relate to concluding Ho or H1 whenconducting a hypothesis testing?
- Q Neuroinvasive West Nile virus refers to a severe disease thataffects a person’s nervous system. It is spread by the Culexspecies of mosquito. In the United States in 2010 there were...
- Q Suppose box 1 has four black marbles and two white marbles, andbox 2 has two black marbles and five marbles. If you picked onemarble from one of the two boxes...
- Q The average life of light bulbs produced by SABA Electric Co. isexpected to be normally distributed with the mean service life of950 hours and standard deviation of 100 hours. A...
- Q Find the area under the standard normal distribution curvebetween =z−1.86 and =z−2.38. Use The Standard Normal DistributionTable and enter the answer to 4 decimal places.
- Q The annual salaries of 16 randomly chosen actuaries are listedbelow. At a=0.01 can you conclude that the standard deviation ofthe annual salaries is greater than $ 20,000 question mark Use...
- Q For many years, TV executives used the guideline that 30% of theaudience were watching each of the traditional bi three prime-timenetworks, and 10% were watching cable stations on a weekday...
- Q 9. In 2001, a total of 15,555 homicide deaths occurred amongmales and 4,753 homicide deaths occurred among females. Theestimated 2001 midyear populations for males and females were139,813,000 and 144,984,000, respectively....
- Q A manufacturer ofbanana chips would like to know whether its bag filling machineworks correctly at the 427 gram setting. It is believed that themachine is underfilling the bags. A 49...
- Q The following data were randomly drawn from an approximatelynormal population.37, 40, 43, 45, 49Based on these data, find a 95% confidence interval for thepopulation standard deviation. Then complete the table...
- Q The age of a students in a class is a normal random variable.There are 80 students in our class. I select 9 students randomlyand calculate the mean of their ages...
- Q Data from the past shows that on average, a ready-mixed concreteplant receives 100 orders for concrete every year. The maximumnumber of orders that the plant can fullfil each week is...
- Q There are two ways for a concrete truck to go from a ready-mixedconcrete plant to the construction site. The first way is direct,for which the mean and standard deviation of...
- Q Historically, the population average waiting time to check outof a supermarket has been 4 minutes. Recently, inan effort to reduce the waiting time, the supermarket experimentedwith a recommendation system that...
- Q Boys and Girls: Suppose a couple plans to havetwo children and the probability of having a girl is 0.50.(a) What is the sample space for the gender outcomes?{bb, bg, gg}{b,g}Â Â Â Â {bb,...
- Q Consider the value of t such that 0.05 of the area under thecurve is to the right of t. Step 2 of 2: Assuming the degrees offreedom equals 20 ,...
- Q Data from the pastshows that on average, a ready-mixed concrete plant receives 100orders for concrete every year. The maximum number of orders thatthe plant can fulfil each week is 2....
- Q There are two ways for a concrete truck to go from a ready-mixedconcrete plant to the construction site. The first way is direct,for which the mean and standard deviation of...
- Q An archaeologist discovers only seven fossil skeletons from apreviously unknown species of horse. Reconstructions of theskeletons of these seven horses show the shoulder heights (incentimeters) to be:132 141 143 107...
- Q Consider the following time series data.Excel File: data17-35.xlsQuarterYear 1Year 2Year 31467223633564578b. Show the four-quarter and centered movingaverage values for this time series (to 3 decimals ifnecessary).YearQuarterTime Series ValueFour-Quarter Moving AverageCentered...
- Q A single observation of a random variable (that is, a sample ofsize n = 1) having a geometric distributionis used to test the null hypothesis θ = θ0 against the...
- Q Assume that the traffic to the web site of Smiley’s People,Inc., which sells customized T-shirts, follows a normaldistribution, with a mean of 4.56 million visitors per day and astandard deviation...
- Q Using standard deviation and variance, what if we wanted tocompare the variation in body lengths of great white sharks andgreater short-horned lizards? What measure of variation would yousuggest we use,...
- Q A chemist in interested in determining the weight loss of aparticular compound as a function of the amount of time thecompound is exposed to the air. The data below give...
- Q The amount of corn chips dispensed into a 13​-ounce bag by thedispensing machine has been identified as possessing a normaldistribution with a mean of 13.5 ounces and a standard deviation...
- Q television have a lifetime of 482 hours; The Sonyfactory makes 10,588  in 3months. the average of atelevision lasting this long is  80 . what is theprobability that 43 televisions out of the...
- Q please answer with explanation using Microsoft word and copyingand pasting the answer here so i can easily copy and paste on myword document. thank you9) A researcher has developed the...
- Q Select all TRUE statements below.: a) A multiple regressionanalysis can be performed with more than one continuous dependentvariable at a time. b) In a two-way between-subjects ANOVA, is itpossible to...
- Q In 2010 the Maricopa Community College District's enrollmentdata showed the following breakdown of students by ethnicity: 54.9%White; 21.1% Hispanic; 7.9% Black; 4.5% Asian/Pacific Islander;2.9% Native American; 8.8% Other. Information was...
- Q A physical therapist wants to determine the difference in theproportion of men and women who participate in regular sustainedphysical activity. What sample size should be obtained if he wishesthe estimate...
- Q How would you use multiple regression analysis to purchase aused car? List all the variables you would use to and what type ofanalysis weights you would place on them?
- Q Imagine a new book that is to be released. Construct theattributes (i.e., the value of independent variables) of this, andestimate the sales rank of it when it is sold on...
- Q The CDC periodically administers large randomized surveys totrack the health of Americans.In a survey of 4378 adults ending in 2016, 70.9% were overweight,andin a survey of 4246 adults ending in...
- Q Anystate Auto Insurance Company took a random sample of 374insurance claims paid out during a 1-year period. The average claimpaid was $1600. Assume σ = $264. Find a 0.90 confidence...
- Q # 2: T test for two meansThe data in SteelStrengthData.txt consists ofn1= 32 strengthmeasurements of cold-rolled steel andn2= 35 measurements oftwo-sided galvanized steel. Import it into the data framedf2 andcomplete...
- Q Question 1“PhysicalFun†is a physical center which opens 24 hours per day.Each member of “PhysicalFun†has an access card. Members would becharged in a weekly basic (Sunday 12:00a.m. to Saturday...
- Q The following questions are based on Chapter 12 (One-WayAnalysis of Variance).1. A researcher wishes to test the differences among fivepopulation means, using the .05 criterion of significance. Why isit a...
- Q Ina study on the role of music and the growth of tomato plants, youplanted 32 tomato plants. Half of the plants grew up without music,while the other half grew up...
- Q A rocket motor is manufactured by bonding together two types ofpropellants, an igniter and a sustainer. The shear strength of thebond y is thought to be a linear function of...
- Q A total of 23 Gossett High School students were admitted toState University. Of those students, 7 were offered athleticscholarships. The school’s guidance counselor looked at eachgroup’s summary statistics of their...
- Q For this problem, carry at least four digits after the decimalin your calculations. Answers may vary slightly due torounding.Santa Fe black-on-white is a type of pottery commonly found atarchaeological excavations...
- Q 1: Explain the term ‘autoregression’ in a time series regressioncontext.2. Explain the term ‘autocorrelation’ and the problems itcreates when using OLS regression in time series data.
- Q Probability and Decision AnalysisA smartphone supplier in Sydney is considering threealternative investment options: a large store, a small store, or anoutlet in the shopping mall.  Profits from selling smartphones will be...
- Q How much do wild mountain lions weigh? Adult wild mountain lions(18 months or older) captured and released for the first time inthe San Andres Mountains gave the following weights (pounds):67...
- Q The table shows the number of computers per household in theUnited States.Computers012345Number of households (in millions)2747241042Construct a probability distribution.Graph the probability distribution using a histogram anddescribe its shape.Find the mean,...
- Q A sample of 25 seniors from a large metropolitan area schooldistrict had a mean Math SAT score of 450. Suppose we know that thestandard deviation of the population of Math...
- Q A researcher wishes to estimate the percentage of adults whosupport abolishing the penny. What size sample should be obtainedif he wishes the estimate to be within 4 percentage points with99​%...
- Q The average American man consumes 9.5 grams of sodium each day.Suppose that the sodium consumption of American men is normallydistributed with a standard deviation of 0.8 grams. Suppose anAmerican man...
- Q A Roofing and Siding company sells its products tohome repair retailers. The owner isinterested in studying the effects of severalvariables on the value of shingles sold ($000).The marketing manageris arguing...
- Q QUESTION 3 A recent study shows that on average 20% of employees in thework population prefer their vacation time during March break.Vincent Company employs 56 people. Use the normalapproximation to...
- Q QUESTION 4 ( 8 marks)A telemarketer is able make a sale on 28% of the phone calls hemakes. Assume that he makes 11 calls in an hour. Answer thefollowing questions,...
- Q 1. Presume that the following data were collected fromrespondents to a poll asking for their rating of the current stateof the economy, ranging from 1 to 100 (1= worst, 100...
- Q Suppose that a recent article stated that the mean time spent injail by a first-time convicted burglar is 2.5 years. A study wasthen done to see if the mean time...
- Q A dog food manufacturer is using a new process to make his dogfood.  He believes the new process affects the taste ofthe food.  To test the new process, the company recruited9 dogs....
- Q Third, the researcher wishes to use numerical descriptivemeasures to summarize the data on each of the two variables: hoursworked per week and income earned per year.(a) Prepare and display a...
- Q Adults around the world watch on average 4 hours of TV a day. Aresearcher thinks that Americans watch less TV than theinternational average. He finds 25 Americans who watch 3...
- Q Third, the researcher wishes to use numerical descriptivemeasures to summarize the data on each of the two variables: hoursworked per week and income earned per year.b. Compute the correlation coefficient...
- Q The average IQ in America is 100. A researcher wants to test thehypothesis that left-handed individuals have different IQs than theaverage American. He administers an IQ test to 8 left-handedindividuals....
- Q How hot is the air in the top (crown) of a hot air balloon?Information from Ballooning: The Complete Guide to Riding theWinds, by Wirth and Young (Random House), claims that...
- Q 1) The waiting time at an elevator is uniformly distributedbetween 30 and 200 seconds. What is the probability a rider waitsless than two minutes?A) 0.4706B) 0.5294C) 0.6000D) 0.70592) For any...
- Q Calculate the t-test statistic for whether the correlationcoefficient between the two variables below differs significantlyfrom 0. (Hint: You will first need to calculate the correlationcoefficient.)14Â Â Â Â Â Â Â Â 1517Â Â Â Â Â Â Â Â 1819Â Â Â Â Â Â Â Â 1321Â Â Â Â Â Â Â Â 223Â Â Â Â Â Â Â Â 411Â Â Â Â Â Â Â Â 59Â Â Â Â Â Â Â Â Â Â 313Â Â Â Â Â Â Â Â 1514Â Â Â Â Â Â Â Â 1821Â Â Â Â Â Â Â Â 2
- Q Second, the researcher wishes to use graphical descriptivemethods to present summaries of the data on each of the twovariables: hours worked per week and income earned per year, asstored in...
- Q A company claims that a new manufacturing process changes themean amount of aluminum needed for cans and therefore changes theweight. Independent random samples of aluminum cans made by the oldprocess...
- Q An agent for a residential real estate company has the businessobjective of developing more accurate estimates of the monthlyrental cost for apartments. Toward that goal, the agent would liketo use...
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