Math 1342: Statistics; Chapters 7-9 Review Professor A. Hoherz Chapter 7 I. An i
ID: 3365569 • Letter: M
Question
Math 1342: Statistics; Chapters 7-9 Review Professor A. Hoherz Chapter 7 I. An interval estimate may or may not contain the true value of the parameter being estimated. A) True B) False 3. What value of "body" of the table for 0.05 and 0.95) 1s used in confidence interval shown below? (Hint: look in the 90% According to a study of 90 truckers, a trucker drives, on average, 540 miles per day. If the standard deviation of the miles driven per day for the population of truckers is 40, find the 99% confidence interval of the mean number of miles driven per day by all truckers. 4. 6. A study of 45 white mice showed that their average weight was 5.7 ounces. The what is the 98% confidence standard deviation of the population is 0.6 ounces, interval for the mean weight per white mouse? 7· The value of /2 used in the figure below is 0.02. 93% A) True B) False 8. The are the number of values that are free to vary after a sample statistic has been computed. 9. A sample of 400 racin g cars showed that 80 of them cost over $700,000. What is the 99% confidence interval for the true p roportion of racing cars that cost over $700,000? Copyright 2012 McGraw-Hill,Bluman1Explanation / Answer
Solution:-
Chapter:- 7
1. option A) True.
3. 90% confidence interva : 1.645 (or) 1.65
4. 99% confidence interval is 2.58 , SE = 40/sqrt(90)
= [ 540 - 2.58 * (4.22) , 540 + 2.58 * (4.22) ]
= [ 529.12,550.88 ]