Psych 625 Time to Practice – Week Three Essay

1330 Words Mar 28th, 2015 6 Pages
University of Phoenix Material

Time to Practice – Week Three

Complete both Part A and Part B below.

Part A

1. For the following research questions, create one null hypothesis, one directional research hypothesis, and one non-directional research hypothesis.

a. What are the effects of attention on out-of-seat classroom behavior?

Null- There are no effects of attention on out of seat classroom behavior.

Non-directional- Attention affects out-of-seat classroom behavior.

Directional- No attention negatively instigates out-of-seat classroom behavior.

b. What is the relationship between the quality of a marriage and the quality of the spouses’ relationships with their siblings?

Null- There is no relationship
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The null hypothesis is accepted because the p-value is significantly greater than the significance level of 0.05 (0.51 > 0.05).

7. Why is it harder to find a significant outcome (all other things being equal) when the research hypothesis is being tested at the .01 rather than the .05 level of significance?

A smaller significance level means the p-value has to be smaller for the null hypothesis to be rejected (Salkind, 2014). To acquire a lower p-value, the absolute test statistic has to be very high (2.5+ for z-test) which usually does not arise with sample data.

8. Why should we think in terms of “failing to reject” the null rather than just accepting it?

The null hypothesis is a claim that says there is no relationship (Salkind, 2014). The goal is to reject this claim, in order to show the experiment is a success. If the goal were to accept the null, every experiment would be ineffective.

9. When is it appropriate to use the one-sample z test?

A one-sample z test is generally used when the population is distributed with a known standard deviation (Salkind, 2014). In a one sample z test, the one sample is being compared to a population.

From Salkind (2011). Copyright © 2012 SAGE. All Rights Reserved. Adapted with permission.

Part B

Complete the following questions. Be specific and provide examples when relevant.

Cite any

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