Statistics question and answers for July 19, 2023
- Q A blind taste test is conducted to determine which of two​colas, Brand A or Brand​ B, individuals prefer. Individuals arerandomly asked to drink one of the two types of cola​...
- Q What direction of bias would weaken a conclusion that there wasnoassociation between exposure and outcome?Choose the single best answer: “toward the nullâ€, “away from thenullâ€, or“cannot determine from the given...
- Q A consumer preference study compares the effects of threedifferent bottle designs (A, B, and C)on sales of a popular fabric softener. A completely randomizeddesign is employed. Specifically, 15 supermarkets of...
- Q Consider the hypotheses shown below. Given that xoverbarequals57​, sigmaequals13​, nequals35​, alphaequals0.10​,complete parts a and b. Upper H 0​: muless than or equals54 Upper H1​: mugreater than54
- Q A telescope contains 3 large mirrors. The time (in years) untila single mirror fails has been investigated by your colleagues. Younow know that the probability that a mirror is still...
- Q A random sample of10191019adults in a certain large country was asked​ \"Do you pretty muchthink televisions are a necessity or a luxury you could do​without?\" Of the10191019adults​ surveyed,522522indicated that televisions...
- Q August, 2018$250.84September, 2018 Â Â $236.61October, 2018$220.70November, 18$230.20December, 2018$180.32January 2019$140.36February, 2019$160.22March, 2019$128.66April 2019$130.12May 2019$106.24June 2019$176.46July 2019$191.45Pick three bills from the last 12 months and change the valuesinto z-scores. What does the z-score...
- Q Suppose X follows a Gamma distribution with parameters α, β, andthe following density function f(x)= [x^(α−1)e^(−x/ β)]/ Γ(α)β^α .Find α and β so that E(X)= Var(X)=1. Also find the median...
- Q How do you interpret the coefficient of determination,coefficient of alienation, standard error of estimate
- Q How do you Interpret the meaning of the different coefficients(b0, b1, b2, b3,b4,…bn) in a multiple regression? (slightlydifferent from the interpretation in simple regression)
- Q From two bags like A and B, A has 2 pink and 3 purple balls, Bhas 4 pink and 5 purple balls. A random ball is received from A. Itis...
- Q Questions 1 through 12 are based on the following You work for amen’s designer apparel company based in the US that is planning toexpand to the Netherlands. Your target market...
- Q Assume that a simple random sample has been selected from anormally distributed population and test the given claim. Identifythe null and alternative​ hypotheses, test​ statistic, P-value, andstate the final conclusion...
- Q Using the z table (The Standard Normal Distribution Table), findthe critical value (or values) for the two-tailed test witha=0.05. Round to two decimal places, and enter the answers separatedby a...
- Q Let X be a continuous random variable having a normalprobability distribution with mean µ = 210 and standard deviation σ= 15.(a) Draw a sketch of the density function of X.(b)...
- Q 4. Interpretation of simple linearregressionThe linear model below explores a potential association betweenproperty damage and windspeed based on observational data from 94hurricanes that hit the United States between 1950 and...
- Q #1A candy company makes chocolates in two flavors, milk anddark. Brenda is a quality control manager for the company who wantsto make sure that each jumbo bag contains about the...
- Q According to the recent survey conducted by Sunny Travel Agency,a marriedcouple spends an average of $500 per day while on vacation.Suppose a sample of 64 couplesvacationing at the Resort XYZ...
- Q The normal distribution is the preferred tool to evaluate markethistorical performance.               a.           What are the basic statistics assumptions for using the normaldistribution?               b.           Under what conditions the normal distribution does not do a goodjob?               c.            What...
- Q ) Grades on a standardized test are known to have a mean of 1000for students in the US. The test is administered to 453 randomlyselected students from Queens College, and...
- Q Create a case on the application of inferences about thedifference between two population means (σ1 and σ2 known) andexplain the hypothesis tests until conclusion.
- Q The Quinnipiac polling institute claims that 70% of college stu-dents live on campus. A researcher takes a sample of 200 collegestudents to see if the proportion is less. In the...
- Q possibility treeOne box contains two black balls (labeled B1 and B2) and onewhite ball. A second box contains one black ball and two whiteballs (labeled W1 and W2). Suppose the...
- Q The table lists height (in) and weights (lb) of randomlyselected 8 students.Height (in) 60 65 66 68 60 67 69 70Weight (lb) 150 152 156 160 160 167 168 170(a)...
- Q Describe two research situations where discriminant analysis canbe used: one situation where the primary interest is in groupclassification and another situation where the primary interest isin the description of the...
- Q Based on extensive testing, a manufacturer of washing machinesbelieves that thedistribution of the time (in years) until a major repair isrequired has a Weibulldistribution with alpa =2/3 and β=2.a. What...
- Q An engineer designed a valve that will regulate water pressureon an automobile engine. The engineer designed the valve such thatit would produce a mean pressure of 4.3 pounds/square inch. It...
- Q 54 randomly selected students were asked how many siblings werein their family. Let X - the number of pairs of siblings in thestudent's family.# of Siblings012345Frequency591013107Round all your answers to...
- Q Please do all parts! Do not use statistics software. I want tosee the formulas.study of the effect of caffeine on muscle metabolism used 24male volunteers who each underwent arm exercise...
- Q 2. A manufacturer of chocolate candies uses machines to packagecandies as they (4 pts) move along a filling line. The companywants the packages to contain 8.1730 ounces of candy. A...
- Q h2 = 1 and that gene frequencies are known.Assume you have 3 beef cows whose birth weights were as follows:A = 65 lbs, B = 75 lbs and C =...
- Q For any confidence interval make sure that you interpret theinterval in context, in addition to using it for inference.A survey is given to 300 random SCSU students to determine theiropinion...
- Q Discuss the uses of data miningHealthcareFinanceRetail and e-commerce
- Q Alarge cube is painted on all six faces. It is then divided into 27smaller, congruent cubes.a) Use a table and a histogram to show the probabilitydistribution for the number of...
- Q A cooking article reported that cooking a quality meal takestime; in fact, the article states that it takes longer than 45.0minutes. Suppose a study is conducted to test the validity...
- Q Problem #4PERT Analysis: Consider the project with thefollowing estimates for activity times and precedence relationships(be sure to use the triple time estimate). All times are indays:ActivityOptimisticTimeMostLikely TimePessimisticTimeImmediatePredecessor(s)A346---B5710---C2311AD258BE177BF357C, DG789D, EH2610FWhat is...
- Q An economist is interested inwhether the level of the minimum wage affects employment. In orderto study this issue they got data from a random sample of 322 NewJersey fast food...
- Q Ina poll 1040 of 2260 respondents said they would prefer to livesomewhere else. Confirm the distribution for p-hat is approximatelynormal and find a 95% confidence interval for the proportion ofpeople...
- Q A 1980 study was conducted whose purpose was to compare theindoor air quality in officeswhere smoking was permitted with that in offices where smoking wasnot permitted. Measurements were madeof carbon...
- Q In one of the studies, it was found that, in a random sample of261 married persons, 135 were smokers while in a sample of 239non-married persons there were 131 smokers.a....
- Q Sansuit Investments is deciding on future investments for thecoming two years and is considering four bonds. The investmentdetails for the next two years are given in the table below.​Investment Requirements...
- Q Weatherwise is a magazine published by the AmericanMeteorological Society. One issue gives a rating system used toclassify Nor'easter storms that frequently hit New England and cancause much damage near the...
- Q A group of n = 25 students was selected at random for studiesrelated to the amount of time they spent for exam preparations.Educators assume that individual records are normally distributedwith...
- Q A shipping freighter has space for two more shipping containers,but the combined weight cannot go over 20 tons. Four shippingcontainers are being considered. The following table providesdetails on the weight...
- Q A beverage can manufacturer makes three sizes of soft drinkcans—Small, Medium and Large. Production is limited by machineavailability, with a combined maximum of 105 production hours perday, and the daily...
- Q In a preliminary study of 45 customers, we ask how much theywould pay for an upgrade to their water filtration system; for thissample, the average price is 35 with a...
- Q The following data represents number of pictures an individualhas posted on Facebook (X) and their level of narcissism(Y) asmeasured on a 10-point scale, 10 being highest.xy143262737636645716819110152151Analyze this data using both...
- Q 3) In a study of student loan subsidies, I surveyed 100students. In this sample, students will owe a mean of $25,000 atthe time of graduation with a standard deviation of...
- Q Part II. Indicate whether you would perform a ztest, two-sample t test, paired t test, or ANOVA for the followingresearch question? All the outcomes are continuousvariables.  A group of adolescent boys...
- Q Discuss the uses of data mining in finance with examples indetail?
- Q In a packing plant, a machine packs cartons with jars. It issupposed that a new machine will pack faster on the average thanthe machine currently used. To test that hypothesis,...
- Q The random variable X can be used to describe the voltage at thereceiver in a modem. If symbol 0 is transmitted, X follows aGaussian distribution centered at −5V with a...
- Q Dean Parmalee wished to know if the year-end grades assigned toWright State University Medical School students are predictive oftheir second-year medical board scores. The following table shows,for 89 students, the...
- Q a sociologist claims the probability that a person picked atandom in times square new york city is visiting the area is 0.83.you think this sounds high and want to see...
- Q A company has discovered that a recent batch of batteries hadmanufacturing​ flaws, and has issued a recall. In a group of 15batteries covered by the​ recall, 3 are dead. Two...
- Q 1- Three forces act on a point: 3 N at 0°, 4 N at 90°,and 5 N at 217°.a. What is the net force? b. What fourth force will putthe...
- Q Sleep: Assume the general population gets anaverage of 7 hours of sleep per night. You randomly select 45college students and survey them on their sleep habits. From thissample, the mean...
- Q Parts are inspected on a production line for a defect. It isknown that 5% of the pieces have this defect. (this applies to 5parts of the problem)to. If an inspector...
- Q 9) In a sample of 400 people selected randomly from one town, itis found that 130 of them are Gamecock Fans. At the 0.05significance level, test the claim that the...
- Q The following times series shows the demand for a particularproduct over the past 10 months. Month Value1 3242 3113 3034 3145 3236 3137 3028 3159 31210 326a. Use α =...
- Q Given two independent random samples with the followingresults:n1=11 x‾1=174 s1=34   n2=8 x‾2=191 s2=22Use this data to find the 90% confidence interval for the truedifference between the population means. Assume that the...
- Q 1. If the number of arrivals at a cell phone kiosk has a rate of0.80 customers per hour.to. What is the probability that less than 2 clients arrive inthe next...
- Q . A researcher wishes to see if the mean number of days that abasic, low-price, small automobile sits on a dealer’s lot is 29. Asample of 30 automobile dealers has...
- Q . It has been reported that the average credit card debt forcollege seniors at the college book store at a college oruniverisity is 3262 dollars. The student senate at a...
- Q 12.25 Mendel formulated the law of independent assortment as hissecond law of inheritance. It involves two genes independentlysegregated during reproduction, each independently determining oneaspect of the phenotype. In one experiment,...
- Q The accompanying table shows a portion of a data set that refersto the property taxes owed by a homeowner (in $) and the size ofthe home (in square feet) in...
- Q Group1: [4,5,3,4,5,5,2]Group2:[3,4,5,2,3,1,1,2]Group3:[1,1,1,2,1,3]Perform a Kruskal-Wallis test, calculate test statistic, findp-value by chi-square approximation, and state you conclusion
- Q A social scientist would like to analyze the relationshipbetween educational attainment (in years of higher education) andannual salary (in $1,000s). He collects data on 20 individuals. Aportion of the data...
- Q A realtor studies the relationship between the size of a house(in square feet) and the property taxes (in $) owed by the owner.The table below shows a portion of the...
- Q Suppose approximately 75% of all marketing personnel areextroverts, whereas about 70% of all computer programmers areintroverts. (For each answer, enter a number. Round your answers tothree decimal places.)(a)At a meeting...
- Q A realtor studies the relationship between the size of a house(in square feet) and the property taxes (in $) owed by the owner.The table below shows a portion of the...
- Q The following data presents the number of units ofproduction per day turnout by 5 different number of workers usingfive different number of machines.                Machines typesWorkers A    B  C   D1.           44  38 47 362.           46...
- Q Identify the null hypothesis, alternative hypothesis,test statistic, P-value, conclusion about the null hypothesis, andfinal conclusion that addresses the original claim. Use the P-valuemethod.Listed below are ages of actresses and actors...
- Q How much does a sleeping bag cost? Let’s say you want a sleepingbag that should keep you warm in temperatures from20oF to 45oF. A random sampleof prices ($) for sleeping...
- Q Let x represent the dollar amount spent on supermarketimpulse buying in a 10-minute (unplanned) shopping interval. Basedon a certain article, the mean of the x distribution isabout $34 and the...
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