I need help with A, C, and D

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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I need help with A, C, and D

To test Ho: µ= 20 versus H,:µ<20, a simple random sample of size n = 18 is obtained from a population that is known to be normally distributed. Answer parts (a)-(d).
Click here to view the t-Distribution Area in Right Tail.
(a) If x = 18.5 and s = 4.1, compute the test statistic.
t=
(Round to two decimal places as needed.)
(b) Draw a t-distribution with the area that represents the P-value shaded. Which of the following graphs shows the correct shaded region?
A.
ОВ.
OC.
(c) Approximate the P-value. Choose the correct range for the P-value below.
O A. 0.15 <P-value < 0.20
B. 0.05 < P-value < 0.10
C. 0.20 < P-value < 0.25
D. 0.10 < P-value < 0.15
(d) If the researcher decides to test this hypothesis at the a = 0.05 level of significance, will the researcher reject the null hypothesis?
O A. The researcher will not reject the null hypothesis since the P-value is less than a.
B. The researcher will not reject the null hypothesis since the P-value is not less than a.
C. The researcher will reject the null hypothesis since the P-value is less than a.
D. The researcher will reject the null hypothesis since the P-value is not less than a.
Transcribed Image Text:To test Ho: µ= 20 versus H,:µ<20, a simple random sample of size n = 18 is obtained from a population that is known to be normally distributed. Answer parts (a)-(d). Click here to view the t-Distribution Area in Right Tail. (a) If x = 18.5 and s = 4.1, compute the test statistic. t= (Round to two decimal places as needed.) (b) Draw a t-distribution with the area that represents the P-value shaded. Which of the following graphs shows the correct shaded region? A. ОВ. OC. (c) Approximate the P-value. Choose the correct range for the P-value below. O A. 0.15 <P-value < 0.20 B. 0.05 < P-value < 0.10 C. 0.20 < P-value < 0.25 D. 0.10 < P-value < 0.15 (d) If the researcher decides to test this hypothesis at the a = 0.05 level of significance, will the researcher reject the null hypothesis? O A. The researcher will not reject the null hypothesis since the P-value is less than a. B. The researcher will not reject the null hypothesis since the P-value is not less than a. C. The researcher will reject the null hypothesis since the P-value is less than a. D. The researcher will reject the null hypothesis since the P-value is not less than a.
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