1. A substance abuse researcher wants to know whether reaction time is decreased by the use of methamphetamines . Reaction times in the general population are distributed normally with a mean of 358.0 milliseconds (msec) and a standard deviation of 30.1 msec. A sample of 30 methamphetamine users is tested. Their mean reaction time is 359.8 msec. What is the value of the upper limit of the 90% Confidence Interval for the mean reaction time of methamphetamine users? Enter value with one decimal.

2. 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 16 students taught with the new method has a mean reading comprehension score of 76.5. The population of all students taught using the old method has a mean reading comprehension score of 74.5 and a standard deviation of 9.3. Assume scores are distributed normally. What is the value of Cohen's d? Enter value with three decimals.

3. An educational psychologist wants to test whether a new teaching method negatively affects reading comprehension scores using a significance level of 0.01. A sample of 26 students taught with the new method has a mean reading comprehension score of 78.0. The population of all students taught using the old method has a mean reading comprehension score of 78.7 and a standard deviation of 5.9. Assume scores are distributed normally. How wide is the 99% 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 decimal places.

4. A substance abuse researcher wants to know whether reaction time is decreased by the use of methamphetamines . Reaction times in the general population are distributed normally with a mean of 358.0 milliseconds (msec) and a standard deviation of 30.1 msec. A sample of 30 methamphetamine users is tested. Their mean reaction time is 359.8 msec. What is the value of the upper limit of the 90% Confidence Interval for the mean reaction time of methamphetamine users? Enter value with one decimal.

5. A social psychologist wants to know whether students' performance on a problem solving task is improved by having other people look on when completing the task using a significance level of 0.05. Scores on the problem solving task in the general population are distributed normally with a mean equal to 48.9 and a standard deviation of 4.9. The researcher selects 14 random students and has them complete the problem solving task. Their mean score is 48.0. What is the value of the effect size? Enter value with three decimals.