20.21 20.19 You have an SRS of nine observations from a Normallydistributed population. What critical value would youuse to obtain an 80% confidence interval for the meanof the population?(a) 1.397(b) 1.383(c) 1.37220.20 You are testing Ho: 100 against H.: 100 basedon an SRS of nine observations from a Normal popula-tion. What values of the t statistic are statistically significant at the a= 0.005 level?(a) t> 3.833(b) t≤-3.833 or t≥ 3.833(c) t-3.690 or t > 3.69020.21 Twenty-five adult citizens of the United States wereasked to estimate the average income of all U.S.households. The mean estimate was x = $70,000and s= $15,000. (Note: The actual average householdincome at the time of the study was about $90,000.)Assume the 25 adults in the study can be consideredan SRS from the population of all adult citizens of theUnited States. A 95% confidence interval for the meanestimate of the average income of all U.S. households is(a) $67,000 to $73,000.(b) $63,808 to $76,192.(c) $83,808 to $96,192.CHAPTER 20 EXERCISES20.25 Read Carefully. You read in the report of a psychologyexperiment: "Separate analyses for our two groups of12 participants revealed no overall placebo effect forour student group (mean = 0.08, SD = 0.37, t₁ = 0.49)and a significant effect for our non-student group(mean = 0.35, SD = 0.37, t₁ = 3.25, p < 0.01)."¹5 Thenull hypothesis is that the mean effect is zero. Whatare the correct values of the two t statistics based on themeans and standard deviations? Compare each correctt-value with the critical values in Table C. What can yousay about the two-sided P-value in each case?Which of the following weabout the validity of the colated in the previous exerci(a) You notice that there is(b) A stemplot of the dat:dure is the appropriat(c) You do not know the p20.23 Which of these settings dpairs t procedure?(a) You interview bothstudents in each ofand ask each how massignments require(b) You interview a samsample of 15 studeper week homewo(c) You interview 4statistics course atagain at the endhours per week b20.24 Because the t procetant condition for r20.2220.26 Body Mass Index of Young Men. In Example 16.1(page 368), we developed a 95% z confidence intervalfor the mean body mass index (BMI) of American men(a) the sample size(b) the population(c) the data canpopulation.study of studentricts. TUDA g500. A score oa score of 299ple of 1100 eistandard erro(a) We don'tof the t p(b) Give a 9of all Dagives thdeviatic(c) Based cthat th

The mean= $70,000 the standard deviation= $15,000. n=25

20.21 Twenty-five adult citizens of the United States were asked to estimate the average income of all U.S. households. The mean estimate was x = = $70,000 and s $15,000. (Note: The actual average household income at the time of the study was about $90,000.) Assume the 25 adults in the study can be considered an SRS from the population of all adult citizens of the United States. A 95% confidence interval for the mean estimate of the average income of all U.S. households is (a) $67,000 to $73,000. (b) $63,808 to $76,192. (c) $83,808 to $96,192.

20.21 Twenty-five adult citizens of the United States were asked to estimate the average income of all U.S. households. The mean estimate was x = = $70,000 and s $15,000. (Note: The actual average household income at the time of the study was about $90,000.) Assume the 25 adults in the study can be considered an SRS from the population of all adult citizens of the United States. A 95% confidence interval for the mean estimate of the average income of all U.S. households is (a) $67,000 to $73,000. (b) $63,808 to $76,192. (c) $83,808 to $96,192.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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