Statistics question and answers for July 25, 2023
- Q An article suggested that yield strength (ksi) for A36 gradesteel is normally distributed with μ = 44 and σ =5.0.(a) What is the probability that yield strength is at most...
- Q There is an archaeological study area located in southwesternNew Mexico. Potsherds are broken pieces of prehistoric NativeAmerican clay vessels. One type of painted ceramic vessel is calledMimbres classic black-on-white. At...
- Q The University of Chicago claims to admit equal numbers ofpublic and private high school graduates. You interview 500undergraduates and discover 267 came from public schools. Assumingthat the U of C...
- Q 1. List all possible samples of n=2 from the followingpopulation {1,2,3,5,6,7} (note that there is no number 4 in thepopulation). Assume that those numbers represent the years of ageof six...
- Q Consider the following ANOVA experiments. (Round your answers totwo decimal places.)(a) Determine the critical region and critical value that areused in the classical approach for testing the null hypothesisH0: μ1...
- Q Suppose you roll two ordinary dice. Calculate the expected valueof their product. Solve using R studio coding.
- Q Compute the number of passwords of each type below along withhow long it would take to test all possible such passwords if ittakes 1 nanosecond to test a password. Report...
- Q A researcher is interested in knowing whether early childhoodeducation has an impact on graduate earnings. She finds 14published studies that have tested the null hypothesis that thereis no impact. Since...
- Q The time that it takes for the next train to come follows aUniform distribution with f(x) =1/10 where x goes between 1 and 11minutes. Round answers to 4 decimal places...
- Q A study of the amount of time it takes a mechanic to rebuild thetransmission for a 2005 Chevrolet Cavalier shows that the mean is8.6 hours and the standard deviation is...
- Q A vitamin K shot is given to infants soon after birth. Nurses atNorthbay Healthcare were involved in a study to see if how theyhandle the infants could reduce the pain...
- Q The research center of a university collects data on employmentand hourly earnings in private industry groups. Eighteen peopleworking in the manufacturing industry are selected at random. Theiraverage hourly earnings, in...
- Q For this problem, carry at least four digits after the decimalin your calculations. Answers may vary slightly due to rounding. Ina random sample of 61 professional actors, it was found...
- Q 1.Seams Personal advertises on its website that 95% of customerorders are received within four working days. They performed anaudit from a random sample of 500 of the 6,000 orders received...
- Q You are evaluating two contractors for cleaning up Superfundsites. You oversee the cleanup of mining Superfund sites andfactory-based Superfund sites. You are interested in selecting thecontractor that has most often...
- Q The Centers for Disease Control reported the percentage ofpeople 18 years of age and older who smoke (CDC website, December14, 2014). Suppose that a study designed to collect new data...
- Q Your insurance company has converged for three types of cars.The annual cost for each type of cars can be modeled using Gaussian(Normal) distribution, with the following parameters: (Discussionsallowed!)Car type 1...
- Q A consumer buying cooperative tested the effective heating areaof 20 different electric space heaters with different wattages.Here are the results.HeaterWattageArea11,25036521,75045532,00054541,80045551,50035561,25035473006581,00035960045101,000551130065122,250545133005514950551530025164003517800551824065191,8004552030025a. Compute the correlation between the wattage and heating area.Is there...
- Q CollinearityDiscuss the problems that result when collinearity is present ina regression analysis.How can you detect collinearity?What remedial measures are available when collinearity isdetected?
- Q One risky and one prudent, two investment startegies arecompared. 7 of the funds following the first strategy have averagereturn of 15% with standard deviation of 12%. 15 of the funds...
- Q You are developing a simple linear regression analysis model.The simple correlation coefficient between y and x is -0.72. Whatdo you know must be true about b1. The least squares estimator...
- Q The Body Mass Index (BMI) is a value calculated based on theweight and the height of an individual. In a small European city, asurvey was conducted one year ago to...
- Q ) Consider the following regression results based on 30observations.y = 238.33 – 0.95x1 + 7.13x2 + 4.76x3; SSE = 3,439y = 209.56 – 1.03x1 + 5.24(x2 + x3); SSE =...
- Q A psychologist conducted an experiment analysing therelationship between student scores in an exam and the amount ofattention they paid in class. The latter was measured using a typeof brain monitor....
- Q 1.  What assumptions must be validated to uset-distribution methods for a single sample mean(confidence interval or hypothesis test)?2. What assumptions must be validated to uset-distribution methods for two independent sample means(confidence...
- Q This is an SPSS question:Demographic data for 1000 individuals is contained in the filedemographic.sav. Use SPSS to conduct a test to determine if thefour levels of education are equally likely...
- Q According to Nielsen Media Research, the average number of hoursof TV viewing per household per week in the United States is 50.4hours.1 (a) Suppose the population standard deviation is 11.8...
- Q Suppose that GE is trying to prevent Maytag from entering themarket for high efficiency clothes dryers. Even though highefficiency dryers are more costly to produce, they are also moreprofitable as...
- Q (a) Using practical examples, differentiate between thefollowing commercial averages: (i) Moving Average(ii) Progressive Average (iii) Composite Average(b) Explain what you understand by a theoretical probabilitydistribution and how it is useful...
- Q TestA               ScoreRespondent        X              Y         x-x       (x-x)2        y-y      (y-y) 2  ( x-x) (y-y)Jones775124.8615.047.860.84193.44Dunn665913.8190.4415.8249.64218.04Dean4144-11.2125.440.80.64-8.96Hampton4734-5.227.04-9.284.6447.84Nichols3228-22.2492.84-15.2231.04337.44  TestB               ScoreRespondent        X              Y         x-x       (x-x)2        y-y      (y-y) 2  ( x-x) (y-y)Jones5051-3.411.567.454.76-25.16Dunn3869-15.4237.1625.40645.16-391.16Dean58344.621.16-9.692.16-44.16Hampton4936-4.419.36-7.657.7633.44Nichols722818.6345.96-15.6243.36-290.16a. Calculate Pearson’s Product MovementCorrelation Coefficient (r) for Test A. Show yourwork. (6 points)b. Based on the correlation coefficient whichyou calculated, in two words...
- Q According to the market research firm NPD Group, Americans atean average of 211 meals in 2001. The following data show the numberof meals eaten in restaurants as determined from a...
- Q It is assumed that there is an average of 12 customers per hour ata service counter according to a Poisson process.a) How likely is it that 4 customers show up...
- Q The data shown in the table were collected by surveying 100employees with five years’ experience. Find the correlationrelationship for the data. Use Microsoft Excel. Create a scatterplot. Identify and discuss...
- Q You may need to use the appropriate technology to answer thisquestion.The following data are from a completely randomized design.TreatmentABC161143126143157121164125137144141139149137151169143124Samplemean155141133Samplevariance122.8107.2130.0(a)Compute the sum of squares between treatments.(b)Compute the mean square between treatments.(c)Compute...
- Q The Pepsi Corporation wants to explore the relationship betweenthe daily temperature in California and the quantity of soft drinksthat it sells at Dadger’s Baseball Stadium. The average dailytemperature for 12...
- Q Graeter’s is thinking about expanding its ice cream flavors.They have created three new flavors of ice cream: (1) LemonMerengue Pie, (2) Butterscotch, and (3) Banana Cream Pie. Theyrecruit 18 people...
- Q A consumer product testing organization uses a survey of readersto obtain customer satisfaction ratings for the nation's largestsupermarkets. Each survey respondent is asked to rate a specifiedsupermarket based on a...
- Q a). A student read that a 95% confidence interval for the meanSAT Mathematics score of Texas high school seniors in 2019 is 467to 489. Asked to explain the meaning of...
- Q Suppose x has a distribution with μ = 45 and σ = 13.(a) If random samples of size n = 16 are selected, can we sayanything about the x distribution...
- Q 85%of the products are defective. Of the Next 15 products, what is theprobability that A) 3-6 are not defective. B) Fewer than 4 are notdefective C) More than 5 are...
- Q Students have shown that children in the US who have beenspanked have a significantly lower IQ score on average thanchildren who have not been spanked.A) What is the explanatory variable...
- Q As the assistant bank manager, you want to provide promptservice for customers at your bank's drive thru window. The bankcan currently serve up to 10 customers per 15-minute period withoutsignificant...
- Q A telephone service representative believes that the proportionof customers completely satisfied with their local telephoneservice is different between the West and the Northeast. Therepresentative's belief is based on the results...
- Q osteoporosis is a condition in which people experiencedecreased bone mass and an increase in the risk of bone fracture.Actonel is a drug that helps combat osteoporosis in postmenopausalwomen. In clinical...
- Q The long-term graduation rate for female athletes at a certainmidwestern university is 72%. A random sample of female athletes atthis school over the past few years showed that 29 of...
- Q Customers arrive in a certain shop according to an approximatePoissonprocess on the average of two every 6 minutes.(a) Using the Poisson distribution calculate the probability oftwo or more customersarrive in...
- Q True or False QuestionsIf the unit cost remains constant, there is no difference in thevalue of stock among actual cost, FIFO, LIFO, and weighted averagecost methods.?LIFO is often expressly prohibited,...
- Q In a sample of 5000 people, 2% of the population have COVID. Intesting, there is a false positive rate of 1.6% and a falsenegative rate of 4%.a. Compile the results...
- Q A researcher wants to study the relationship between salary andgender. She randomly selects 324324 individuals and determinestheir salary and gender. Can the researcher conclude that salaryand gender are dependent?Below $25,000$â¢25,000261743$25,000$â¢25,000-$50,000$â¢50,000372663$50,000$â¢50,000-$75,000$â¢75,0003690126Above...
- Q Women athletes at the a certain university have a long-termgraduation rate of 67%. Over the past several years, a randomsample of 40 women athletes at the school showed that 21...
- Q A scientist is studying the relationship between x =inches of annual rainfall and y = inches of shorelineerosion. One study reported the following data. Use the followinginformation to solve the...
- Q Inthe Mega Million Lottery, you pick five numbers from 1 – 75 AND onenumber from 1 – 15.What is the probability you match ALL the numbers?
- Q Determine the critical value for a right-tailed test regarding apopulation propotion at the alpha = 0.05 level of signficiancez=
- Q what does the operation \"recode into different variables\" do todata in spss
- Q Multiple choice problem:Question:Munchies Cereal Company makes a cereal from several ingredients.Two of the ingredients, oats and rice, provide vitamins A and B.The company wants to know how many ounces of...
- Q Suppose Jamal is studying poverty in his economics class, and hewants to compare the proportion of individuals living below thepoverty line in the western United States in different years. Hecollects...
- Q The success rate of corneal transplant surgery is 85%. Thesurgery is performed on six patients.Construct a binomial distribution.Graph the binomial distribution using a histogram and describeits shape.Find the mean, variance,...
- Q Bag 1 contains 3 red balls and 7 green balls. Bag 2 contains 8red balls and 4 green balls. Bag 3 contains 5 red balls and 11green balls. Bag 1...
- Q A company claimed that every​ 18-ounce bag of their chocolatechip cookies contained at least 1000 chocolate chips. Dedicatedstatistics students at a school purchased some randomly selectedbags of cookies and counted...
- Q You and a group of friends wish to start a company. You have anidea, and you are comparing startup incubators to apply to.(Startup incubators hold classes and help startups to...
- Q 3. Consider the following sample data and hypotheses. Assumethat the populations are normally distributed withunequal variances.Sample Mean1 = 262Â Â SampleVariance1 = 23Â Â Â Â n1 =10Sample Mean2 = 249Â Â SampleVariance2 = 35Â Â Â Â ...
- Q Two professors at a local college developed a new teachingcurriculum designed to increase​ students' grades in math classes.In a typical developmental math​ course, 53​% of the studentscomplete the course with...
- Q Statistics concepts for engineering management:The data in the table provides: College GPA, High School GPA,SAT total score, and number of letters of reference.  a. Generate a model for college GPA...
- Q One card is drawn from an ordinary deck of 52 cards. Find theprobabilities of drawing the following cards.a. An 8 or 2b. A black card a 9c. A 2 or...
- Q ANALYZE/INTERPRET THE STUDY AS WELL AS YOUR CONCLUSIONS FROMYOUR CALCULATIONSDVR’s allow us to skip commercials when watching TV. Some alsoallow advertisers to see which ads are actually watched.Advertising research indicates...
- Q Let X be the number of students who attend counseling at acertain time of day. Suppose that the probability mass function isas follows p (0) = .15, p (1) =...
- Q The table below contains the amount that a sample of ninecustomers spent for lunch ($) at a fast-food restaurant:4.88 5.01 5.79 6.35 7.39 7.68 8.23 8.71 9.88a. Compute the sample...
- Q Ofthe 35 doctors offices within a 10 mile radius, 9 have only onephysician on staff, 15 have two on staff, 6 have three physicianson staff, and 5 have four physicians...
- Q 4. In a sample of 10 people in Japan average lifeexpectancy is 85 years with a sample standard deviation of 3 years.In a sample of 8 people in South Korea,...
- Q 15. A sample of 10 networking sites for a specific month has amean number of visits of 26.1 and a standard deviation of 4.2. Finda 99 percent confidence interval of...
- Q 6. Suppose that the sample unemployment rate for thoseaged 25–60 is 8% based on a survey of 150 people, while theunemployment rate for those aged 16–24 is 12% based on...
- Q In 2011 home prices and mortgage rates dropped so low that in anumber of cities the monthly cost of owning a home was lessexpensive than renting. The following data show...
- Q Assignment 3: Data Analysis with Graphs AssignmentData Set A Masses, to the nearest kilogram, of 30 men: 74 52 6768 71 76 86 81 73 64 75 71 57 67...
- Q Consider the following scenario and address the questions thatfollow.Your leader has asked you to evaluate the defects based oninsurance claim type (auto vs. injury). You have a total of 600claims,...
- Q The Scholastic Aptitude Test (SAT) contains three areas:critical reading, mathematics, and writing. Each area is scored onan 800-point scale. A sample of SAT scores for six studentsfollows.Using a .05 level...
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