4. A random sample of 25 employees for the retailer showed a samplemean of 9.2 minutes and a standard deviation of 2 minutes. Assume thatthe time spent by employees on personal phone calls is normallydistributed. Let u denote the mean time spent by employees spent onpersonal phone calls.(a) Find the 95% confidence interval for u.(b) An employee group for a national retailer claims that the mean timespent by employees on personal phone calls is less than 10 minutesper day. Specify the correct null and alternative hypotheses you woulduse to investigate the employee group's claim.(c) Find the value of the standardized test statistic.(d) Find the rejection region at a = .05 and state your conclusion in thecontext of the problem.

From given data we have : x¯=9.2,s=2n=25

Answered: 4. A random sample of 25 employees for…

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 the quarterly sales levels among health care information systems companies are approximately normally distributed with a mean of 8 million dollars and a standard deviation of 1.3 million dollars. One health care information systems company considers a quarter a "fallure" if its sales level that quarter is in the bottom 10% of all quarterly sales levels. Determine the sales level (in millions of dollars) that is the cutoff between quarters that are considered "failures" by that company and quarters that are not. Carry your Intermediate computations to at least four decimal places. Round your answer to one decimal place. million dollars X S Save For Later Ⓒ2022 McGraw Hill LLC. All Rights Reserved. Terms of Use 4 O * Check tab esc ! 1 ← 9. a @ 2 → W S # N = 3 C e $ 4 d r % 5 f acer Oll A t 6 g O. & 7 y h * u 8 j ( 1 9 k m 0 O P 1 M Submit Assignment Privacy Center Accessibility 10:12 backspace { 1 8民口團 11 D ?
Suppose that the quarterly sales levels among health care information systems companies are approximately normally distributed with a mean of 12 million dollars and a standard deviation of 1.3 million dollars. One health care information systems company considers a quarter a "failure" if its sales level that quarter is in the bottom 20% of all quarterly sales levels. Determine the sales level (in millions of dollars) that is the cutoff between quarters that are considered "failures" by that company and quarters that are not. Carry your intermediate computations to at least four decimal places. Round your answer to one decimal place. million dollars X S
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