9. A two-sample t-test for a difference in means will be conducted to investigate whether the average length of a cell phone call is shorter this year compared with 5 years ago. From a random sample of 35 phone call records this year, the average length was 25 minutes with a standard deviation of 4 minutes. From a random sample of 32 phone call records from 5 years ago, the average length was 27 minutes with a standard deviation of 5 minutes. The difference (this year minus five years ago) in means will be calculated. With a null hypothesis of no difference in length, which of the following is a correct test statistic for the test? 25–27 t = A 42 52 V 35 * 32 25–27 t = B 4 35 32 25–27 t = 42 52 35 32 27-25 t = 42 52 V 35 32 27-25 E 4 + 35 32

9. A two-sample t-test for a difference in means will be conducted to investigate whether the average length of a cell phone call is shorter this year compared with 5 years ago. From a random sample of 35 phone call records this year, the average length was 25 minutes with a standard deviation of 4 minutes. From a random sample of 32 phone call records from 5 years ago, the average length was 27 minutes with a standard deviation of 5 minutes. The difference (this year minus five years ago) in means will be calculated. With a null hypothesis of no difference in length, which of the following is a correct test statistic for the test? 25–27 t = A 42 52 V 35 * 32 25–27 t = B 4 35 32 25–27 t = 42 52 35 32 27-25 t = 42 52 V 35 32 27-25 E 4 + 35 32

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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Concept explainers

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

Question

9. A two-sample t-test for a difference in means will be conducted to investigate whether the average length of
a cell phone call is shorter this year compared with 5 years ago. From a random sample of 35 phone call
records this year, the average length was 25 minutes with a standard deviation of 4 minutes. From a random
sample of 32 phone call records from 5 years ago, the average length was 27 minutes with a standard
deviation of 5 minutes. The difference (this year minus five years ago) in means will be calculated.
With a null hypothesis of no difference in length, which of the following is a correct test statistic for the
test?
25–27
t
A
42. 52
35
32
25–27
t =
B
5
35
32
25–27
42
52
35
32
27–25
42
52
35
32
27-25
t =
5
+
35
4
32

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