1. An educational psychologist wants to test whether a new teaching method negatively affects reading comprehension scores using a significance level of 0.05. A sample of 7 students taught with the new method has a mean reading comprehension score of 77.5 and a standard deviation of 10.6. Students taught using the old method have a mean reading comprehension score of 74.3. Assume scores are distributed normally. How wide is the 95% Confidence Interval (i.e., upper limit - lower limit) for the mean reading comprehension scores of students taught using the new method? Enter value with three decimals.

2. A pharmaceutical company wants to test whether taking their new anti-anxiety drug has the side effect of affecting systolic blood pressure of patients using a significance level of 0.05. Assume SBPs in the population of US adults are distributed normally with a mean of 119.2. A sample of 16 US adults treated with the new drug has a mean SBP of 118.0 and a standard deviation of 13.0. What is/are the critical value(s) of the test statistic?

a. -2.13. b. +/-1.75. c. +/-2.13. d.+2.13.