Statistics question and answers for July 29, 2023
- Q According to the census bureau publication: current constructionreports, the mean price of new mobile homes is 63,500. The standarddeviation of the prices is 5,500.a). For samples 100 new mobile homes,...
- 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 fulfil each week is...
- Q Two plots at Rothamsted Experimental Station were studied forproduction of wheat straw. For a random sample of years, the annualwheat straw production (in pounds) from one plot was as follows.6.40...
- Q Stanley’s Secretarial Services uses an average of 1,215 boxes ofenvelopes each year. Carrying costs per box are $75 per year, andit costs $10 to place and receive an order.a.What is...
- Q The art of institutions of the development of the world.1. The smaller, or more restricted, a range of scores, the morelikely that the Pearson correlation will overestimate the truestrength of...
- Q SALARYEDUCEXPERTIME390001201402001044742900125304380086743800886438001207438001201043800125644400157524500085234500012819462001252348000870204800012623480001211124800012111748000126322480001214424480001216312480001222826480001238114800016214154980083182551000896335100012361551000125914510001511515100015165451000161231251600121812522008102295220012127295280089011528008190152800121071154000817334540008228335400012261154000123633540001238225400012822954000121692754000122441540001524135400015492754000155121540001512233552001297175520012196325580012133305640012559570001290235700012117255700015511757000156111570001524134600001212130600001579136120012209216300012873363000152311546200121222504001514351000121801551000123152522001229145400012721540001238115400012113354000151885400015359115700015365600008320216000012242600001232176000012498600001256336000012252116000012272196000015251360000153632600001556126000015643360000151081660000164636300015721766000156416660001584336600015216166840015427690001217510690001513224810001655SUMMARY OUTPUTRegression StatisticsMultiple R0.41198516R Square0.16973178Adjusted R Square0.16060795Standard Error6501.12045Observations93ANOVAdfSSMSFSignificance FRegression178625342978625342918.603134.08E-05Residual913.85E+0942264567.1Total924.63E+09CoefficientsStandard Errort StatP-valueLower 95%Upper 95%Lower 95.0%Upper 95.0%Intercept38185.59793774.376610.1170611.45E-1630688.2625245682.9330688.2645682.93X Variable 11280.85932296.967124.313135124.08E-05690.97061641870.748690.97061870.748This data set was obtained by collecting information on arandomly selected sample of 93...
- Q An airline estimates that 80% of passengers who reserve thetickets actually show up for the flights. Based on thisinformation, it has to decide how many tickets it will sell foreach...
- Q The quantitative reasoning GRE scores are known to approximatelyhave a Normal distribution with a mean of ï = 151.3 points and astandard deviation of ï³ = 8.7 points.a. Use the...
- Q Determine the critical value.Using the z-tables (or t-tables), determine the critical valuefor the left-tailed z-test with α=0.01Question options:a)-2.326         b)2.326         c)2.576d)-2.576
- Q Since an instant replay system for tennis was introduced at amajor​ tournament, men challenged 1441 referee​ calls, with theresult that 422 of the calls were overturned. Women challenged 758referee​ calls,...
- Q 3,500 women between the ages 60 -74 years are in a townconsisting of a population of 15,000 persons. 85 cases of cancerare in the town one year and 30 of...
- Q The table below givesthe list price and the number of bids received for five randomlyselected items sold through online auctions. Using this data,consider the equation of the regression line, yˆ=b0+b1xy^=b0+b1x,for...
- Q Congratulations! After passing your course in BusinessStatistics, you received a job as a statistical analyst at a majorbusiness corporation. Your first task is to decide whichstatistical test would be the...
- Q How do I do this in Minitab 1. The data set ‘Golf Disks’ is theweight in grams of a random sample of 12 Golf Disks (for playingdisk golf). Construct a...
- Q The director of research and development is testing a newmedicine. She wants to know if there is evidence at the 0.05 levelthat the medicine relieves pain in less than 397...
- Q Some statistics students estimated that the amount of changedaytime statistics students carry is exponentially distributed witha mean of $0.72. Suppose that we randomly pick 25 daytimestatistics students.1. Give the distribution...
- Q South Shore Construction builds permanent docks and seawallsalong the southern shore of Long Island, New York. Although thefirm has been in business only five years, revenue has increasedfrom $315,000 in...
- Q Professor decided to conduct an experiment determining thedifferences taking tutoring or not across college year onstatistics grades.NotTutoringSenior8590Sophomore8085Is there an interaction, if yes, what are the effects?
- Q Nine people (Ann, Ben, Cal, Dot, Ed, Fran, Gail, Hal, and Ida)are in a room. Five of them stand in a row for a picture. In howmany ways can this...
- Q Every 4 years, we come together as a nation to vote on who willrepresent us as a nation, who will lead the country in domestic andforeign affairs, who will hold...
- Q Suppose that the abilities of two new radar systems to detectpackages dropped by an airplane are being compared. In a series oftrials, radar system #1 detected the packages being dropped...
- Q A clinical trial isrun to evaluate the efficacy of a new medication to relieve pain inpatients undergoing total knee replacement surgery. In the trial,patients are randomly assigned to receive either...
- Q An employer believes that there is a correlation between thenumber of years of service and how many sick days an employee takesin a year. A random sample of 13 employees...
- Q Is your complete second-order model astatistically useful model for predicting your dependent variable?Justify your response.complete model =B0+B1X1+B2(X1)2+B3X2+B4X1X2+B5(X1)2X2
- Q he scores of students on the ACT (American College Testing)college entrance examination in a recent year had the normaldistribution with mean μ = 18 and standard deviation σ = 6....
- 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 scores of students on the ACT (American CollegeTesting)college entrance examination in a recent year had thenormal distribution with meanμ= 18 and standard deviationσ= 6. 100students are randomly selected from...
- Q Microplastics have been found in both tap water and bottledwater.Bottled water results A study analyzed 259 bottlesand found an average of 320 plastic particles for every liter ofwater being sold....
- Q A magazine provided results from a poll of 1500 adults who wereasked to identify their favorite pie. Among the 1500 ​respondents,11% chose chocolate​ pie, and the margin of error was...
- Q a give the probability of getting a sequence of Gold then Silverthen Blue on three consecutive spins. b.If the wheel is spun fourtimes, give the probability of getting Blue only...
- Q A boot making company produces women’s cowboy boots. The bootscome in either square toe or round toe options. In an effort toestimate the proportion of boots sales at their Calgary...
- Q A statistical program is recommended.The owner of a movie theater company would like to predictweekly gross revenue as a function of advertising expenditures.Historical data for a sample of eight weeks...
- Q Suppose that in a city of 120,000 people the average income is40,000 (dollars). Use the basic estimates we learned for â€tailprobabilities†to:(a) Find an upper bound for the number of...
- Q The results from a two-factor experiment can be presented in amatrix with the levels of one factor forming the rows and thelevels of the second factor forming the columns, with...
- Q A study is run to estimate the average number of toilet paperrolls a typical U.S. household currently have. Say a sample of 10households is selected last month and they reported...
- Q 1  26.51  28.71  25.11  29.11  27.22  31.22  28.32  30.82  27.92  29.63  27.93  25.13  28.53  24.23  26.54  30.84  29.64  32.44  31.74  32.8Q1:• Test for equal variations using the Bartlett test.Calculating the...
- 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 CGPAHSGPASATREF2.042.01107052.563.4125463.753.68146661.11.54706433.32116050.050.3375631.380.36105821.51.97100871.382.03110444.012.05120071.52.1389671.291.3484831.91.5195853.113.12124661.922.14110640.812.679051.011.995443.663.061500621.610465a. Generate a model for college GPA as a function of the otherthree variables.b. Is this model useful? Justify your conclusion.c. Are any of the variables not useful predictors? Why?
- Q A survey of high school students revealed that the numbers ofsoft drinks consumed per month was normally distributed with mean25 and standard deviation 15. A sample of 36 students was...
- Q I have the following statistics problem.  Katrina wants to estimate the proportion of adult Americans whoread at least 10 books last year. To do so, she obtains a simplerandom sample of...
- Q A sociologist was hired by a large city hospital to investigatethe relationship between the number ofunauthorized days that employees are absent per year and thedistance (miles) between home andwork for...
- Q Question: 9 hypertension patients in a clinic use anexperimental drug for treatment. The systolic blood pressurereading for these patients before and after using the drug are asfollows:Assume that blood pressure...
- Q Six people are in a room, 3 men and 3 women, and two individualsare selected.What is the probability of both being women, given that one is awoman?What is the probability...
- Q Discuss the problems of using a self-report questionnaire withsmokers in a smoking cessation clinic. What percentage might bemotivated to indicate that they had stopped when in fact they werestill smoking?...
- Q Photon Technologies, Inc., a manufacturer of batteries formobile phones, signed a contract with a large electronicsmanufacturer to produce three models of lithium-ion battery packsfor a new line of phones. The...
- Q A CI is desired for the true average stray-load loss μ(watts) for a certain type of induction motor when the line currentis held at 10 amps for a speed of...
- Q Americans receive an average of 20 Christmas cards each year.Suppose the number of Christmas cards is normally distributed witha standard deviation of 6. Let X be the number of Christmas...
- Q A study was conducted to determine the effects of two factorson the latherability of soap. The two factors were type of water(tap or distilled) and glycerol (present or absent). The...
- Q . A recent drug survey showed an increase in the use of drugsand alcohol among local high school seniors as compared to thenational percent. Suppose that a survey of 100...
- Q Hardly a day goes by without some new poll being published.Polls influence the choice of candidates and the direction of theirpolicies, especially during election campaigns. For example, theGallup Organization polled...
- Q A sociologist was hired by a large city hospital to investigatethe relationship between the number of unauthorized days thatemployees are absent per year and the distance (miles) between homeand work...
- Q For the standard normal distribution, find the value of c suchthat:P(z > c) = 0.0025
- Q Jorge Jones, a recent management graduate has a new job as ashelf stocker at the local Shop and Stop (bad job market). In orderto maintain some of the knowledge he...
- Q Solve the problem.A one-sided confidence interval for p can be written as p<Â Â + E or p >Â Â - E where the margin oferror E is modified by replacing z/2 with z....
- Q A statistics professor at a large university hypothesizes thatstudents who take statistics in the morning typically do betterthan those who take it in the afternoon. He takes a random sampleof...
- Q We draw a random sample of size 36 from a population withstandard deviation 3.2. If the sample mean is 27, what is a 95%confidence interval for the population mean?
- Q To investigate the efficacy of a diet, a random sample of 16male patients is drawn from a population of adult males using thediet. The weight of each individual in the...
- Q The Pat-A-Cake Pastry Shop makes chocolate cake in three sizes –Small, Medium, and Large. For each size, the number of cakes madeis an integer (i.e. the shop does not bake...
- Q The amount of syrup that people put on their pancakes isnormally distributed with mean 55 mL and standard deviation 11 mL.Suppose that 17 randomly selected people are observed pouring syrupon...
- Q FIREFLIES (6 pts)Â Â Â Â Â Â Â Your hard work buildingthe fancy fire pit you saw on Pinterest has really paid off! Nowevery weekend evening in the summer your neighbors and their kidscome over...
- Q Three experiments investigating the relation between need forcognitive closure and persuasion were performed. Part of the studyinvolved administering a \"need for closure scale\" to a group ofstudents enrolled in an...
- Q Problem 12. Peter and Paula play a game of chance that consistsof several rounds. Each individual round is won, with equalprobabilities, by either Peter or Paula; the winner then receivesone...
- 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 165 potsherds indicated that78 were of the...
- Q A researcher hypothesizes that short term memory predictsvocabulary knowledge. A random sample of Army recruits is selectedand given the digit span (a short term memory test) and vocabularysubtests of the...
- Q For this problem, carry at least four digits after the decimalin your calculations. Answers may vary slightly due torounding.A random sample of 5380 permanent dwellings on an entirereservation showed that...
- Q A sample of 220 patients of a family medicine practice wassurveyed two weeks after their doctor's visit to ask them whetherthe symptoms that prompted their visit improved, and whether theycomplied...
- 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 8 percent of all city A residents are known to haveabnormal blood pressure requiring some form of medication(give answers to 4 places past decimal)1. What is the sampling distribution for...
- Q Two chemical companies can supply a raw material. Theconcentration of an element in this material is important. A randomsample with 9 observations from company 1 yields a sample mean of12.6...
- Q The marketing director for a cereal company would like to knowwhat proportion of households that receive free samples of cerealwith their newspapers later purchase the cereal. A random sampleshowed 55...
- Q You are interested in constructing a 99% confidence interval forthe proportion of all caterpillars that eventually becomebutterflies. Of the 356 randomly selected caterpillars observed, 42lived to become butterflies. Round answers...
- Q For this assignment, please submit the answers to the followingquestions, as well as an Excel spreadsheet which documents the workyou did.Do poets die young? According to William Butler Yeats, “She...
- Q The manager of a computer software company wishes to study thenumber of hours senior executives by type of industry spend attheir desktop computers. The manager selected a sample of fiveexecutives...
- Q Note: Each bound should be rounded to three decimalplaces.Q: A random sample of n=100 observationsproduced a mean of x⎯⎯⎯=35 with a standarddeviation of s=5.(a) Find a 95% confidence interval for...
- Q If n = 460 and X = 368, construct a 99% confidence interval forthe population proportion, p.Give your answers to three decimals
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