Question

Stats Homework

1. In your own words describe what is meant by a null hypothesis.

2. In your own words describe what is meant by a research hypothesis.

3. For the following four questions (A-D), use a distribution with a mean of 47 and a standard deviation of 7.4.10.

A. What is the probability of a score falling between a raw score of 42 and 52?

B. What is the probability of a score falling above a raw score of 60?

C. What is the probability of a score falling between a raw score of 57 and 63?

D. What is the probability of a score falling below a raw score of 39?

4. What is the probability that a raw score will lie at or above a 67 in a normal distribution with a mean of 100 and a standard deviation of 10?

5. What is the probability that a raw a score will lie at or below 105 in a normal distribution with a mean of 100 and a standard deviation of 10?

6. What is meant by the term “significance”? How is significance level related to what you learned in previous chapters about probability?

7. If you fail to reject the null hypothesis when it is, in fact, false; what type of error is this called?

8. If you retain the null hypothesis when it is, in fact, true; have you made an error? If so, which one?

9. If you reject the null hypothesis, when it is, in fact, true, what type of error have you committed?

10. What are the conventional levels of significance set by most researchers? What do these values mean?

11. What is the critical value?

12. Using SPSS software, Create a null and research hypothesis for each of the following topics:

a. Effect of Drug A and Drug B on a disease.

b. Effect of household income on student grades.

c.Effect of watering on plant growth.

d. Effect of advertising spending on product sales.

Answer 1