We are interested in determining whether or not the variances of the sales at two music stores (A and B) areequal. A sample of 16 days of sales at store A has a sample variance of 20 while a sample of 26 days of salesfrom store B has a sample variance of 30. The test statistic is(A) 1.50 (B) 1.69 (C) 2.25 (D) 2.50

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Answered: We are interested in determining…

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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Suppose that 67% of college students in Australia use more than 1.65 gigabytes of data ontheir mobile phone per month. If the monthly mobile data usage by college students isnormally distributed with variance of 2.25, what will be the average mobile data usage?a. 0.66 b. 0.99 c. 2.31 d. 2.64
3. A study was conducted to determine whether the type of patient care (full-time, part-time) is associated with the restless behaviors of elderly individuals in need of care. The data are given in the table below. Is there a difference in restless behavior periods between individuals in full-time and part-time care? (Variances are considered homogeneous, a = 0.05). Group Restless behavior Group Restless behavior time (hours) time (hours) Full time Part time 1 Full time 3 Part time Full time 4 Part time 4 Full time 1 Part time 4 Full time 2 Part time 2 Full time Part time Full time 2
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We are interested in determining whether or not the variances of the sales at two music stores (A and B) are equal. A sample of 16 days of sales at store A has a sample variance of 20 while a sample of 26 days of sales from store B has a sample variance of 30. The test statistic is
Noise pollution is measured in decibels. In California any motorcycle made after 1980 may not be any louder than 80 decibels. Harley Davidson claims their mean decibel rating on bikes is 70 with a variance of 10. The variance of the noise is questioned. Just because Harley has a mean that is less than 80, they could still be producing louder than acceptable bikes. The federal EPA conducts a sample of 30 bikes and determines the variance to be 20 decibels. Is there enough evidence to question Harley’s claim of 10 decibels?

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