Chapter 9, Problem 12P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

Many animals, including humans, tend to avoid direct eye contact and even patterns that look like eyes. Some insects, including moths, have evolved eye-spot patterns on their wings to help ward off predators, Scaife (1976) reports a study examining how eye-spot patterns affect the behavior of birds. In the study, the birds were tested in a box with two chambers and were free to move from one chamber to another. In one chamber, two large eye-spots were painted on one wall. The other chamber had plain walls. The researcher recorded the amount of time each bird spent in the plain chamber during a 60-minute session. Suppose the study produced a mean of *M* = 37 minutes in the plain chamber with *SS* = 288 for a sample of *n* = 9 birds. (*Note:* If the eye spots have no effect, then the birds should spend an average of

a. Is this sample sufficient to conclude that the eye-spots have a significant influence on the birds’ behavior? Use a two-tailed test with

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

c. Construct the 95 confidence interval to estimate the mean amount of time spent on the plain side for the population of birds.

**a.**

To determine

**To state:** The decision of hypothesis test performed for the given question using two-tailed test.

Explanation

**Given info:**

The data has the sample size of 9 with the population mean, sample mean, and sum of square (SS) is 30, 37 and 288.

**Calculation:**

The test hypotheses are:

Null Hypothesis is

Alternate Hypothesis is

*Degrees of Freedom:*

The critical value is obtained from the t-table for

The standard error, s:

The estimated standard error, s_{m}

**b.**

To determine

**To find:** The Cohen’s *d* and

**c.**

To determine

**To find:** Make a 95% confidence interval estimate for the given question.

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