Before changes to its management staff, an automobile assembly line operation had a scheduled mean completion time of 14.6 minutes. The standard deviation of completion times was 1.6 minutes. An analyst at the company suspects that, under new management, the mean completion time, μ , is now less than 14.6 minutes. To test this claim, a random sample of 150 completion times under new management was taken by the analyst. The sample had a mean of 14.4 minutes. Can we support, at the 0.01 level of significance, the claim that the population mean completion time under new management is less than 14.6 minutes? Assume that the population standard deviation of completion times has not changed under new management. Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list of formulas.) (a) State the null hypothesis H0 and the alternative hypothesis H1 . H0: H1: (b) Determine the type of test statistic to use. ▼(Choose one) (c) Find the value of the test statistic. (Round to three or more decimal places.) (d) Find the critical value. (Round to three or more decimal places.) (e) Can we support the claim that the population mean completion time under new management is less than 14.6 minutes? Yes No

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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Related questions

Question

Before changes to its management staff, an automobile assembly line operation had a scheduled mean completion time of

14.6

minutes. The standard deviation of completion times was

1.6

minutes. An analyst at the company suspects that, under new management, the mean completion time,

, is now less than

14.6

minutes. To test this claim, a random sample of

150

completion times under new management was taken by the analyst. The sample had a mean of

14.4

minutes. Can we support, at the

0.01

level of significance, the claim that the population mean completion time under new management is less than

14.6

minutes? Assume that the population standard deviation of completion times has not changed under new management.

Perform a one-tailed test. Then complete the parts below.

Carry your intermediate computations to three or more decimal places, and round your responses as specified below. (If necessary, consult a list of formulas.)

(a)	State the null hypothesis H0 and the alternative hypothesis H1 .
H0:
H1:
(b)	Determine the type of test statistic to use.
	▼(Choose one)
(c)	Find the value of the test statistic. (Round to three or more decimal places.)

(d)	Find the critical value. (Round to three or more decimal places.)

(e)	Can we support the claim that the population mean completion time under new management is less than 14.6 minutes?
Yes No