7. Conduct a complete hypothesis test:

Taking vitamin C is thought to help shorten the duration of a cold. Without daily intake of vitamin C, the general population usually experiences a mean duration of = 10 days having a cold, with a standard deviation of = 2 days. For a sample of 64 participants, the mean duration of having common cold symptoms is M = 6.8 days after taking vitamin C daily.

1. What is the independent variable?
2. What are the levels of the independent variable?
3. What is the level of measurement of the independent variable?
4. What is the dependent variable?
5. What is the level of measurement of the dependent variable?
6. If you were to graph your results, what type of graph would you make? Explain.
7. Is there a significant difference in the number of days of having common cold symptoms

after daily intake of Vitamin C compared to the general population?

Test at the alpha = .05 level.

1. Compute Cohen's d.
2. Give a full APA summary of your findings.
3. What is the probability that we made a Type I error? What would this probability be in

terms of the independent and dependent variables?

1. Is there a risk of a Type II error? Explain.