# 7.1 solutions - DO NOT POST THESE ANSWERS ONLINE BFW...

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DO NOT POST THESE ANSWERS ONLINE© BFW Publishers 2014Chapter 7: Sampling DistributionsChapter 7Section 7.1Check Your Understanding, page 425:1.The parameter is20μ=ounces of iced tea.The statistic is19.6x=ounces of iced tea.2.The parameter is0.10,p=or 10% of passengers.The statistic isˆ0.08,p=or 8% of thesample of passengers.Check Your Understanding, page 428:1. The individuals are the M&M’S Milk Chocolate Candies, the variable is the color of theM&M, and the parameter of interest is the proportion of orange M&M’S.The graph belowshows the population distribution.2.The graph below shows a possible distribution of sample data.For this sample there are 11orange M&M’S so11ˆ0.22.50p==3.The middle graph is the approximate sampling distribution ofˆ.pThe statistic measures theproportion of orange candies in samples of 50 M&M’S.Assuming that the company is correct,20% of the M&M’S are orange, so the center of the distribution ofˆpshould be at approximately0.20.The first graph shows the distribution of the colors for one sample, rather than thedistribution ofˆpfrom many samples, and the third graph is centered at 0.40 rather than 0.20.
DO NOT POST THESE ANSWERS ONLINE© BFW Publishers 2014The Practice of Statistics for 5/eCheck Your Understanding, page 434:1.The median does not appear to be an unbiased estimator of the population median.The meanof the approximate sampling distribution of the sample median (73.5) is not equal to the medianof the population (75).2.Increasing the sample size from 10 to 20 will decrease the spread of the sampling distribution.Larger samples provide more precise estimates because larger samples include more informationabout the population distribution.3.The sampling distribution of the sample median is skewed to the left and unimodal.Exercises, page 436:7.1(a)Population: all people who signed a card saying that they intend to quit smoking.Parameter:the proportion of the population who actually quit smoking.Sample:a randomsample of 1000 people who signed the cards.Statistic: the proportion of the sample who actuallyquit smoking;ˆ0.21.p=(b)Population:all the turkey meat.Parameter:minimum temperature in all of the turkey meat.Sample:four randomly chosen locations in the turkey.Statistic:minimum temperature in thesample of four locations; sample minimum =170 F.o7.2(a)Population:individuals in U.S. households.Parameter:proportion of the U. S.

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