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Lab 8 on Confidence Interval, Effect Size, and Statistical Power 1. Calculate the 95% confidence interval for the following fictional data regarding daily TV viewing habits: u = 4.7 hours; o = 1.3 hours; sample of 78 people with a mean of 4.1 hours. 1) What are the z cutoffs for the 95% confidence level? (1 point) 2) What is the standard error? (1 point) 3) What is the upper bound? (1 point) 4) What is the lower bound? (1 point) 5) State the confidence interval using brackets (1 point). 2. Calculate the 80% confidence interval for the same fictional data regarding daily TV viewing habits: / = 4.7 hours; o = 1.3 hours; sample of 78 people with a mean of 4.1 hours. 1) What are the z cutoffs for the 80% confidence level? (1 point) 2) What is the standard error? (1 point) 3) What is the upper bound? (1 point) 4) What is the lower bound? (1 point) 5) State the confidence interval using brackets (1 point). 3. Calculate the effect size for each of the following average SAT math scores. Remember, SAT math is standardized such that / = 500; o = 100. And then, identify the size of effect using Cohen's guidelines: small, medium, and large). a. 61 people sampled with a mean of 480 (2pts: make sure to indicate both the effect size and the size of the effect according to Cohen's guidelines) b. 82 people sampled with a mean of 520 (2pts) c. 6 people sampled with a mean of 610 (2pts) 4. Regarding statistical power, what are the pieces of information you need in order to calculate it? (4pts) 5. List all five factors that affect statistical power and discuss why they would increase power (5pts). 6. Were you in class on Friday for Lab 8? (5pts)