Stats Worksheet—Correlation and Stats Worksheet—t-Test

Stats Worksheet—t-Test 1. A population is: A sample is: 2. Explain why we test the sample (rather than the population) and the risks in doing so: 3. A t-test is used to: 4. Using males and females as levels for the independent variable and communication competence scores as the dependent variable, write a null hypothesis and an alternative (research) hypothesis that could use at-test as the statistical tool. a. Null hypothesis: b. Alternative (research) hypothesis: 5. Most statistical tests in the social sciences use a .05 significance level. Explain what that means: 6. Husbands and wives were compared for their level of satisfaction with their marital interaction. The research hypothesis is as follows: There is a difference between Husbands and Wives in their satisfaction with marital interactions. Write a null hypothesis for this example. Suppose the calculated value is t = -3.15, and the critical value is 2.12. What is your decision about the null hypothesis? What can you conclude about satisfaction in marital interactions? Stats Worksheet—Correlation 1. A correlation is a 2. A perfect positive correlation of +1.00 means that 3. A correlation of .00 means that 4. A perfect negative correlation of –1.00 means that 5.Dr. Jones hypothesizes that when people are giving directions, their number of hand movements will be positively correlated to their number of facial expressions. To test this hypothesis, Dr. Jonesobserves 6 people and records their number of hand movements and facial expressions while they are giving directions.The data are as follows: Subject Number Number of Changes in Number of Changes in Hand Movements Facial Expressions 1 2 5 2 7 9 3 5 8 4 2 5 5 3 3 6 8 6 Hypothesis: When people are giving directions, the number of hand movements will be positively correlated to the number of facial expressions. Write the null hypothesis. Suppose the calculated value was r = +0.81 and the critical value was .72 Based on this information, what would you decide about the null hypothesis? What would you conclude about the relationship between hand movements and facial expressions during direction-giving?