Answered: On average, they report 6.6 hours a…

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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Question

In this question, you are asked to use the t-test

A newspaper article says that on the average, college freshman spend 7.5 hours a week going to parties. One administer does not believe that these figures apply at her college, which has nearly 3,000 freshman, as she believe freshmen spent less time going to parties. She takes a simple random sample of 100 freshman and interviews them. On average, they report 6.6 hours a week going to parties, and the sample SD (or SD+) is 9 hours.

Is the difference between the sample average (6.6 hours) and average under the null hypothesis (7.5 hours) real?

Hint: Recall that you need to use the t-statistic here.

Group of answer choices

The z-test statistic is between -1 and 1 (inclusive), so the difference looks like chance.

The z-test statistic is between -1 and 1 (inclusive), so the difference appears to be real.

The z-test statistic is smaller than -1 or larger than 1, so the difference looks like chance.

The z-test statistic is smaller than -1 or larger than 1, so the difference appears to be real.

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