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20.19 You have an SRS of nine observations from a Normally distributed population. What critical value would you use to obtain an 80% confidence interval for the mean of the population? (a) 1.397 (b) 1.383 (c) 1.372 20.20 You are testing Ho: 100 against H: 100 based on an SRS of nine observations from a Normal popula-

20.19 You have an SRS of nine observations from a Normally distributed population. What critical value would you use to obtain an 80% confidence interval for the mean of the population? (a) 1.397 (b) 1.383 (c) 1.372 20.20 You are testing Ho: 100 against H: 100 based on an SRS of nine observations from a Normal popula-

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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20.19- 20.24
20.19 You have an SRS of nine observations from a Normally distributed population. What critical value would you use to obtain an 80% confidence interval for the mean of the population? (a) 1.397 (b) 1.383 (c) 1.372 20.20 You are testing Ho: = 100 against H: 100 based on an SRS of nine observations from a Normal popula- tion. What values of the t statistic are statistically sig- nificant at the a= 0.005 level? (a) t> 3.833 (b) t≤-3.833 or t≥ 3.833 (c) t-3.690 or t≥ 3.690 0.21 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. HAPTER 20 EXERCISES Read Carefully. You read in the report of a psychology experiment: "Separate analyses for our two groups of Exercises 459 20.22 Which of the following would cause the most worry about the validity of the confidence interval you calcu- lated in the previous exercise? 20.24 (a) You notice that there is a clear outlier in the data. (b) A stemplot of the data is bell-shaped, so a z proce- dure is the appropriate procedure. (c) You do not know the population standard deviation o. 20.23 Which of these settings does not allow use of a matched pairs t procedure? (a) You interview both the instructor and one of the students in each of 20 introductory statistics classes and ask each how many hours per week homework assignments require. (b) You interview a sample of 15 instructors and another sample of 15 students and ask each how many hours per week homework assignments require. (c) You interview 40 students in the introductory statistics course at the beginning of the semester and again at the end of the semester and ask how many hours per week homework assignments require. Because the t procedures are robust, the most impor- tant condition for their safe use is that (a) the sample size is at least 15. (b) the population distribution is exactly Normal. (c) the data can be regarded as an SRS from the population. study of student achievement in large urban school dis tricts. TUDA gives a mathematics test scored from 0 to
Transcribed Image Text:20.19 You have an SRS of nine observations from a Normally distributed population. What critical value would you use to obtain an 80% confidence interval for the mean of the population? (a) 1.397 (b) 1.383 (c) 1.372 20.20 You are testing Ho: = 100 against H: 100 based on an SRS of nine observations from a Normal popula- tion. What values of the t statistic are statistically sig- nificant at the a= 0.005 level? (a) t> 3.833 (b) t≤-3.833 or t≥ 3.833 (c) t-3.690 or t≥ 3.690 0.21 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. HAPTER 20 EXERCISES Read Carefully. You read in the report of a psychology experiment: "Separate analyses for our two groups of Exercises 459 20.22 Which of the following would cause the most worry about the validity of the confidence interval you calcu- lated in the previous exercise? 20.24 (a) You notice that there is a clear outlier in the data. (b) A stemplot of the data is bell-shaped, so a z proce- dure is the appropriate procedure. (c) You do not know the population standard deviation o. 20.23 Which of these settings does not allow use of a matched pairs t procedure? (a) You interview both the instructor and one of the students in each of 20 introductory statistics classes and ask each how many hours per week homework assignments require. (b) You interview a sample of 15 instructors and another sample of 15 students and ask each how many hours per week homework assignments require. (c) You interview 40 students in the introductory statistics course at the beginning of the semester and again at the end of the semester and ask how many hours per week homework assignments require. Because the t procedures are robust, the most impor- tant condition for their safe use is that (a) the sample size is at least 15. (b) the population distribution is exactly Normal. (c) the data can be regarded as an SRS from the population. study of student achievement in large urban school dis tricts. TUDA gives a mathematics test scored from 0 to
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