Help with Stats?
Choose one 12th-grader at random. What is the probability (±±0.1) that his or her score is higher than 306 ? ____
Higher than 370 (±±0.001)? ____
Now choose an SRS of 4 twelfth-graders and calculate their mean score x. If you did this many times, what would be the mean of all the x-values? _____
What would be the standard deviation (±±0.1) of all the x-values? _____
What is the probability that the mean score for your SRS is higher
than 306 ? (±±0.1) _____
Higher than 370 ? (±±0.0001) ____