Chapter 9, Problem 8P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

A random rumple of *n* = 25 individuals is selected from a population with
*M* = 22.2 with *SS* = 384*.*

a. How much difference is there between the mean for the treated sample and the mean for the original population? (*Note:* In a hypothesis test, this value forms the numerator of the t statistic.)

b. If there is no treatment effect, how, much difference is expected between the sample mean and its population mean? That is, find the standard error for *M.* (*Note:* In a hypothesis test, this value is the denominator of the *t* statistic.)

c. Based on the sample data, does the treatment have a significant effect? Use a two-tailed test with

**a.**

To determine

**To find:** The difference between the mean for the treated sample and the mean for the original population for the given question

Explanation

**Given info:**

A sample of 25 individuals is selected from a population with mean 20. The sample mean and sum of squared difference (SS) is found to be 22.2 and 384 respectively.

**Calculation:**

The difference can be calculated using formula:

...**b.**

To determine

**To find:** The standard error for mean.

**c.**

To determine

**To find:** Whether or not the treatment has significant effect at

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