Chapter 9, Problem 23P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

Research examining the effects of pie school child care has found that children who spent time in day care, especially high-quality day care, perform helter on math and language tests than children who stay home with their mothers (Broberg, Wessels, Lamb, & Hwang, 1997). In a typical study, a researcher obtains a sample of *n* = 10 children who attended day care before starting school. The children are given a standardized math test for which the population mean is

a. Is this sample sufficient to conclude that the children with a history of preschool day care are significantly different from the general population? Use a two-tailed test with

b. Compute Cohen's *d* to measure the size of the preschool effect.

c. Write a sentence showing how the outcome of the hypothesis lest and the measure of effect size would appear in a research report.

**a.**

To determine

**To check:** Whether the children with a history of preschool day-care are significantly different than that of general population using two-tailed test with

Explanation

**Given info:**

A sample of 10 individual is selected from a population with mean 50. Two-tailed hypothesis test using

**Calculations:**

The test hypothesis are:

Null Hypothesis is

Alternate Hypothesis is

*Degrees of Freedom:*

For a two-tailed test with

The t-statistics is obtained by,

**Software procedure:**

Step-by-step procedure to obtain the sample mean and standard error,

- Go to
**Variable View>**Enter the name of the variable as**Sample.** - Go to
**Data View**>Enter the values of**Samples.** - Choose
**Analyze > Descriptive Statistics>**choose**Descriptive**

**b.**

To determine

**To find:** The Cohen’s d.

**c.**

To determine

**To State: ** The outcome of hypothesis test and measure of effect size will appear in the research report.

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