Psych 625 Time to Practice – Week Three Essay
Time to Practice – Week Three
Complete both Part A and Part B below.
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 …show more content…
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.
Complete the following questions. Be specific and provide examples when relevant.