Statistics question and answers for August 16, 2023
- Q Suppose that the sample unemployment rate for those aged 25–60is 8% based on a survey of 150 people, while the unemployment ratefor those aged 16–24 is 12% based on a...
- Q Efficiency experts study the processes used to manufacture itemsin order to make them as efficient as possible. One of the stepsused to manufacture a metal clamp involves the drilling of...
- Q 4.07. A taxi company manager is trying to decide whether the useof radial tires instead of regular belted tires improves fueleconomy. Randomly selected 12 cars with radial tires yielded in...
- Q Suppose that researchers study a sample of 50 people andfind that 10 are left-handed.(a) Find a 95% confidence interval for the populationproportion that is left-handed.(b) What would the confidence interval...
- Q Describe a situation where you would use ANOVA by stating 1. thequantity of populations that are to be investigated, 2. aquantitative variable on these populations, 3. the sizes of samplesfrom...
- Q A study indicates that​ 18- to​ 24- year olds spend a meanof140140minutes watching video on their smartphones per month. Assumethat the amount of time watching video on a smartphone per...
- Q Here are summary statistics for randomly selected weights ofnewborn​ girls:nequals=187187​,x overbarxequals=32.132.1​hg,sequals=7.37.3hg. Construct a confidence interval estimate of the mean. Usea9090​%confidence level. Are these results very different from theconfidence interval31.431.4hgless than<muμless...
- Q Type the following table, which has historical world populationdata, into sheet 2 in rows 1 and 2.Year 1000 1650 1800 1850 1900 1920 1930 World population, inmillions 200 545 924...
- Q A new program of imagery training is used to improve theperformance of basketball players shooting free-throw shots. Thefirst group did an hour imagery practice, and then shot 30 freethrow basket...
- Q Listed below are measured amounts oflead in the air. The EPA has established an air quality standardfor lead of 1.5 μg/m3. The measurements shownbelow were recorded at Building 5 of...
- Q During an angiogram, heart problems can be examined through asmall tube threaded into the heart from a vein in the patient’sleg. It is important the tube is manufactured to have...
- Q 17. Claim: The average cost to repair washing machine A is thesame as the average cost to repair washing machine B. Test at α =0.05 Data: A sample of 14...
- Q A U.S. Senate Judiciary Committee report showed the number ofhomicides in each state. In Indiana, Ohio, and Kentucky, the numberof homicides was, respectively, 380, 760, and 260. Suppose astratified random...
- Q A recent graduate moving to a new job collected a sample of themonthly rent (in dollars) and the size (in square feet) of3-bedroom apartments in one area of a city....
- Q An important quality characteristic used by the manufacturer ofBoston and Vermont asphalt shingles is the amount of moisture theshingles contain when they are packaged. Customers may feel thatthey have purchased...
- Q When estimating a multivariate model using OLS.Discuss possible problems, such as multicollinearity,heteroscedasticity and simultaneous equation bias.
- Q Complete the following problems using R.PLEASE SHOW ANSWER IN R FORMATand be sure to turn in explanations andinterpretations where appropriate.2.A random sample of 15 values of PAR (photosynthetically activeradiation) were...
- Q A researcher is curious if age makes a difference in whether ornot students make use of the gym at a university. He takes a randomsample of 30 days and counts...
- Q 1. The owner of the Original Italian Pizzeria restaurant chainwould like to predict the sales of her specialty deep-dish pizza.She has gathered data on the monthly sales of deep-dish pizzas...
- Q Book: Probability and Statistical Inference (9th & 10thedition respectively)Chapter 8: Tests of Statistical HypothesesSection 8.6 [Best Critical Regions]: Problem 8 (9th Edition) ORSection 8.7 [Best Critical Regions]: Problem 8 (10th...
- Q Suppose a batch of steel rods produced at a steel plant have amean length of 151 millimeters and a variance of 64.If 116 rods are sampled at random from the...
- Q A random sample of 75 pre-school children was taken. The childwas asked to draw a nickel. The diameter of that nickel wasrecorded. Their parent's incomes (in thousands of $) and...
- Q You wish to determine if there is a linear correlation betweenthe two variables at a significance level of α=0.01α=0.01. You havethe following bivariate data set.xy53.8140.759.6106.591.78.385.52393.142.277.748.371.486.769.585.180.959.162.5112.779.610376.66976.132.1What is the critival value for...
- Q A cell phone company offers a simple extended warranty plan. Ifyour phone is damaged, they will repair it for up to $50. If youlose or destroy your phone, they will...
- Q 1. If n=10, ¯ x (x-bar)=43, and s=10, find themargin of error at a 95% confidence level (use at least two decimalplaces)2. If n=11, ¯x (x-bar)=35, and s=4, find themargin...
- Q 1. If n=28, x¯ (x-bar)=50, and s=6, find themargin of error at a 95% confidence level (use at least two decimalplaces)2. What is the margin of error for a poll...
- Q An exercise science major wants to try to use body weight topredict how much someone can bench press. He collects the datashown below on 30 male students. Both quantities are...
- Q . Suppose 2% of people have Syndrome X. We have a Syndrome Xdetecting test which gives which gives a positive result for 90% ofpeople who do have the syndrome, but...
- Q Although it is generally assumed that routine exercise willimprove overall health, there is some question about how muchexercise is necessary to produce the benefits. To address thisquestion, a researcher obtained...
- Q 9. Mutual funds mix different types of investments which altersperformance. Use the tab titledBESTFUNDS1 to determine if there is adifference between the one-year and three-year annualized returnfor the 20 mutual...
- Q 10. Companies often have different mutual funds to servedifferent investment time horizons. Use the tab titledBESTFUNDS to determine if there is adifference between in the three-year annualized return for smallcap...
- Q Year # AIDS cases diagnosed # AIDS deathsYear# AIDS cases diagnosed# AIDS deathsPre–19819129198131912119821,17045319833,0761,48219846,2403,466198511,7766,878198619,03211,987198728,56416,162198835,44720,868198942,67427,591199048,63431,335199159,66036,560199278,53041,055199378,83444,730199471,87449,095199568,50549,456199659,34738,510199747,14920,736199838,39319,005199925,17418,454200025,52217,347200125,64317,402200226,46416,371Total802,118489,093Graph \"year\" vs. \"# AIDS deaths.\" Do not include pre-1981. Labelboth axes with words. Scale both axes. Calculate...
- Q A production line manager wants to determine how well theproduction line is running. He randomly selected 90 items off ofthe assembly line and found that 8 were defective. (Assume allconditions...
- Q A program was created to randomly choose customers at a clothingstore to receive a discount. The program claims 22% of the receiptswill get a discount in the long run. The...
- Q Word Problems with a Sample Data Set:A sample of Full-time SUNY Poly students were asked how manycredit hours they were taking this semester and the followinginformation was obtained. Assume credit...
- Q A thermocouple is being calibrated with a well designed icebath. The measurements are given in the table to the right. Usingany mathematical tool of your choice,the mean is .174 and...
- Q A box in a certain supply room contains four 30W lightbulbs,five 60W lightbulbs, and six 70W lightbulbs. Suppose that fourlightbulbs are randomly selected. 1) What is the probability thatat least...
- Q A company wants to apply k-NN to find out whether new customersresponse to its marketing campaign or not. We have data of sixexisting customers and their response. In the table...
- Q González Industries requires its sales personnel to keep trackof their weekly contacts with customers. A sample of 16 reportsshowed a mean of 32.4 customer contacts per week for the salespersonnel,...
- Q Assume a binomial probability distribution hasp = 0.60andn = 300.(a)What are the mean and standard deviation? (Round your answers totwo decimal places.)mean standard deviation(b)Is this situation one in which binomial...
- Q One pharmaceutical company claims their flu vaccine reduces therisk of illness by 40%. One political pundit believes that the realpercentage is less. He does a study and the conclusion of...
- Q The following sample observations were randomly selected:12345X:1589128Y:2522161614Â Â Â Â Â Â Â Â Â Â Â Â a. Not available in Connect.b. Determine the regression equation.(Negative answer should be indicated by a minus sign. Donot round intermediate calculations. Round the final...
- Q How to do survival analysis in excel with this dataLife expectancy of males in years from 2005 to 2015Country2005, LE-M (years)2015, LE-M (years)Afghanistan55.861.1Albania72.375.6Algeria70.174.1Angola47.557.4Antigua and Barbuda71.573.3Argentina70.672.2Armenia69.170.6Aruba71.572.9Australia77.880.2Austria75.978.4Azerbaijan64.668.6Bahamas7072Bahrain74.275.6Bangladesh66.269.8Barbados71.472.9Belarus62.366.5Belgium75.378Belize65.767.2Benin54.658.5Bhutan62.768.6Bolivia (Plurin. State of)60.165.3Bosnia and Herzegovina7273.7Botswana47.359.8Brazil67.371Brunei...
- Q The postanesthesia care area (recovery room) at St. Luke’sHospital in Maumee, Ohio, was recently enlarged. The hope was thatthe change would increase the mean number of patients served perday to...
- Q Sports that involve a significant amount of running, jumping, orhopping put athletes at risk for Achilles Tendinopathy (AT), aninflammation and thickening of the Achilles tendon. A study in amedical journal...
- Q The company manufactures chocolate bars with nominal weight of115 g per bar. In order to to avoid risk of short changing, themean weight is set as 117 g and SD...
- Q There are 2 full boxes of numbered tickets. The numbers in box Ahave a mean = 10 and a standard deviation = 5. For box B,mean=10,SD= 9.A) If you draw...
- Q 1) The proportion of people at shopping mall who wear red shirtsis p = 0.18. What is the mean of the sampling distribution given asample size of 50? What is...
- Q A researcher is trying to predict test scores from student’slevel of stress. What is the standardized regression equation forthe following data taken from 10 students? The average level ofstress for...
- Q A spinner has 8 equal sections numbered 1 to 8. what is theprobability of th spinner stopping on a number that is a multipleof 3 or is greater than 5?
- Q (1) What two plots might you use to check whether a given timeseries is stationary? How are they used?(2) What plot might you use to determine the order of an...
- Q 7.) The target temperature for a hot beverage the moment it isdispensed from a vending machine is 173â—¦F. A sample of 15 randomlyselected servings from a newly manufactured vending machine...
- Q How to do survival analysis in excel with this dataLife expectancy of females in years from 2005 to 2015Country2005, LE-F(years)2015, LE-F(years)Afghanistan58.163.5Albania77.879.9Algeria72.976.5Angola52.563Antigua and Barbuda76.478.2Argentina78.179.8Armenia75.377Aruba76.477.8Australia82.884.4Austria81.783.5Azerbaijan70.374.6Bahamas76.278.1Bahrain75.977.5Bangladesh67.372.9Barbados7677.7Belarus73.777.7Belgium81.483Belize71.672.7Benin57.761.4Bhutan63.168.9Bolivia (Plurin. State of)64.370.2Bosnia and Herzegovina77.578.8Botswana5166.1Brazil7578.4Brunei Darussalam77.578.4Bulgaria75.877.8Burkina Faso52.659.3Burundi53.758Cabo...
- Q In an examination of holiday spending (known to be normallydistributed) of a sample of 16 holiday shoppers at a local mall, anaverage of $54 was spent per hour of shopping....
- Q The table below gives the number of parking tickets received inone semester and the GPA for five randomly selected collegestudents who drive to campus. Using this data, consider theequation of...
- Q Structurally deficient highway bridges. Data onstructurally deficient highway bridges is compiled by the FederalHighway Administration (FHWA) and reported in the National BridgeInventory (NBI). For each state, the NBI lists the...
- Q Suppose a retailer claims that the average wait time for acustomer on its support line is 173 seconds. A random sample of 56customers had an average wait time of 164...
- Q Given the following hypothesis:H0 : μ ≤ 11H1 : μ > 11For a random sample of 10 observations, the sample mean was 13and the sample standard deviation 4.20. Using the...
- Q The new candy Green Globules is being test-marketed in an areaof upstate New York. The market research firm decided to sample 6cities from the 45 cities in the area and...
- Q A particular baseball team wins 68% of its games. Next week itwill play 6 games. (a) What is the team’s expected number of winsduring that week? (Round your answer to...
- Q Use the sample data and confidence level given below to completeparts​ (a) through​ (d).A research institute poll asked respondents if they feltvulnerable to identity theft. In the​ poll, n equals...
- Q A sample of 50 females is given a test and they score an averageof 75 on it. A sample of 36 males is also given the test and scorean average...
- Q What is Cramer's V for each of the following values for thechi-square test for independence? (Round your answers to twodecimal places.)(a) X2 = 3.95, n = 50, dfsmaller = 1...
- Q Consider the class average in an exam in a few differentsettings. In all cases, assume that we have a large classconsisting of equally well-prepared students. Think about theassumptions behind the...
- Q Advertisers contract with Internet service providers and searchengines to place ads on websites. They pay a fee based on thenumber of potential customers who click on their ad. Unfortunately,click fraud—the...
- Q A survey of the mean number of cents off that coupons give wasconducted by randomly surveying one coupon per page from the couponsections of a recent Rockford newspaper. The following...
- Q A sample of students from an introductory psychology class werepolled regarding the number of hours they spent in studying for thelast exam. All students anonymously submitted the number of hourson...
- Q The following 5 questions are based on thisinformation.A random sample of 25 Apple (the company) customers who call AppleCare Support line had an average (X bar) wait time of 187...
- Q Let x = red blood cell (RBC) count in millions percubic millimeter of whole blood. For healthy females, xhas an approximately normal distribution with mean μ = 5.2and standard deviation...
- Q What is the age distribution of adult shoplifters (21 years ofage or older) in supermarkets? The following is based oninformation taken from the National Retail Federation. A randomsample of 895...
- Q Student affairs departments at colleges provide programs andevents that offer students opportunities to learn outside oftraditional coursework. One popular avenue of engagement chosen bystudents is intramural sports. Does participation in...
- Q StatisticsLet us compare the failure times of certain type of light bulbproduced by two different manufacturers, X and Y, by testing 10bulbs selected at random from each of the outputs....
- Q For a data set obtained from a sample, n=75 and x¯=47.80. It isknown that σ=3.8.a. What is the point estimate of μ?The point estimate is .b. Make a 90% confidence...
- Q Test a model that tries to explain differences in BMI based onparents' average BMI, a person's age, number of weekly hours ofexercise, and the number of times a person eats...
- Q Suppose a government official wants to know whatproportion of residents are infected with the an illness. There area limited number of tests. So a random sample of 180 residents wastaken,...
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