Chapter 11, Problem 9P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

When you get a surprisingly low price on a product do you assume that you got a really good deal or that you bought a low-quality product? Research indicates that you are more likely to associate low price and low quality if someone else makes the purchase rather than yourself (Yan & Sengupta, 2011). In a similar study, *n* – 16 participants were asked to rate the quality of low-priced items under two scenarios: purchased by a friend or purchased yourself. The results produced a mean difference of *M _{D}* = 2.6 and

**a.** Is the judged quality of objects significantly different for self-purchases than for purchases made by others? Use a two-tailed test with α = .05.

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

**a.**

To determine

Quality of objects differs significantly for self-purchases than for purchases made by others.

Explanation

**Given info:**

Numbers of participants in the sample are

Sample mean difference

Sum of squares is

Level of significance for two tailed test is

**Calculation:**

State the hypotheses:

*Null Hypothesis:*

That is, the quality of objects does not differ significantly for self-purchases than for purchases made by others.

*Alternate Hypothesis:*

That is, the quality of objects differs significantly for self-purchases than for purchases made by others.

In repeated-measures study, *t* statistic under null hypothesis is given by:

**b.**

To determine

Cohen’s d to measure the size of the treatment effect.

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