Posted by **Anonymous** on Friday, October 14, 2011 at 8:55pm.

For each of the following situations, determine:

a) the null and research hypotheses;

b) the hypothesis test used (normal curve, single sample t-test, dependent samples t-test, independent samples t-test, ANOVA). For situations 1, 3, 4, and 5, also state whether the test is unilateral or bilateral;

c) the degrees of freedom

d) the critical value (cutoff score on the comparison distribution);

e) your sample’s test score;

f) your conclusion on whether to accept or reject the null hypothesis (you must show how the comparison of your cutoff score with your sample’s test score leads to your conclusion).

For each situation, assume that any information that is not provided is therefore unknown to the researcher. Also, assume that the level of significance (alpha) is 0.05.

1. A researcher wants to determine whether alcohol increases the amount of motor coordination errors. She selects two samples of 25 participants each. One group receives 5 ounces of alcohol, while the other group receives 5 ounces of water. She then observes the amount of errors that the participants make in a labyrinth. The test statistic was 2.81.

2. The same researcher wants to study the effect of caffeine on memory. She selects four samples of 15 participants each. The groups receive 0, 2, 4, and 6 cups of coffee, respectively. The researcher takes note of the amount of words that the participants remember after studying them for 20 seconds. The test statistic was 3.15.

## Answer This Question

## Related Questions

- Statistical reasoning in Psychology - 4. Suppose that previous studies have ...
- Statistics Help !!!! - Are my answers here correct ? Research questions for z ...
- Statistics - Are my answers here correct ? Research questions for z test, t test...
- Statistics Help !! - Are my answers here correct ? Research questions for z ...
- stats - Which test should be used one samples t test, independent samples t ...
- stats - Which test should be used one samples t test, independent samples t ...
- statistics - A credit card company estimates that the average credit card ...
- Statistics - Twenty (20) students randomly assigned to an experimental group ...
- PsychologicaStatistics - Suggest one psychological research question that could ...
- Psy - Suggest one psychological research question that could be answered by each...

More Related Questions