# Sx=13.050n-1050.000fy thatnean isinter-ider8.37 Grandmas using e-mail For the question about e-mail inECH the previous exercise, the 14 females in the GSS of age atleast 80 had the responsesed?0,0,0, 0, 1, 1, 1,2, 2, 6, 6, 7, 7, 10.ist-tablea. Using the web app, software or a calculator, find thesample mean and standard deviation and the standarderror of the sample mean.y Itb. Find and interpret a 90% confidence interval for thepopulation mean.c. Explain why the population distribution may beskewed right. If this is the case, is the interval youobtained in part b useless, or is it still valid? Explain.anу 2014ex plot9, 630.8.38 Wage discrimination? According to a union agreement,the mean income for all senior-level assembly-line work-ers in a large company equals \$500 per week. A represen-tative of a women's group decides to analyze whether themean income for female employe es matches this norm.For a random sample of nine female employees, usingsoftware, she obtains a 95% confidence interval of (371,509). Explain what is wrong with each of the following in-terpretations of this interval.a. We infer that 95 % of the women in the populationhave income between \$371 and \$509 per week.95%ce onHOwained? Statistical Inference: Confidence Intervals364Chapter 8the sarb. If random samples of nine women were repeatedly se-lected, then 95% of the time the sample mean incomewould be between \$371 and \$509.size ofthe sathe apc. We can be 95% confident that x is between \$371and \$509.8.43 Effectestimd. If we repeatedly sampled the entire population,then 95% of the time the population mean would bebetween \$371 and \$509.deviatdencethe chHow often read a newspaper? For the FL StudentSurvey data file on the book's website, software reportsthe results for responses on the numberof times a weekthe subject reads a newspaper:8.39the ba8.44 Catalproduaboudecid95.0% CIMean Std Dev SE MeanVariablederec(3.307, 4.859)3.00.3884.160Newssampordea. Is it plausible that p 7, where u is the populationmean for all Florida students? Explain.mearof \$1b. Suppose that the sample size had been 240, withx=4.1 and s 3.0. Find a 95% confidence intervaland compare it to the one reported. Describe the effectof sample size on the margin of error.c. Does it seem plausible that the population distributionof this variable is normal? Why?а. IsVb. Fthd. Explain the implications of the term robust regard-ing the normality assumption made to conduct thislctl

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8.38 A,B,C

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Step 1

a) We infer that 95% of the women in the population have income between \$371 and \$509 per week.

This conclusion is wrong because it is not telling about true population parameter i.e. mean.

b)

If random samples of nine women were repeatedly selected, then 95...

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