Friday

October 24, 2014

October 24, 2014

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

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 samples 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 samples 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 ...

Psy - Suggest one psychological research question that could be answered by each...

MATH STATS - For each of the following samples that were given an experimental ...

Stats help - Which test should be used one samples t test, independent samples t...

Statistics - 1. z test 2. t test for independent samples, and 3. t test for ...