1. Approximately 18% of people in the United States follow one sport. Assume 738 people in the United States are randomly selected.
a. Find the mean. Do not round.
Mean = type your answer...
b. Find the variance. Do not round.
Variance = type your answer...
c. Find the standard deviation. Round answer to one decimal place.
Standard deviation = type your answer...
2
2. Assume the distribution is normal. A study was done on people who slept less than five hours the night before the study. A short story was read to them, and
they were asked to recall the story. The mean accuracy score is 11.47, and the standard deviation is 4.92.
a. Find the cutoff accuracy score for the top 8.85%. Round answer to two decimal places.
z-value = type your answer...
Top 8.85% cutoff = type your answer...
b. Find the cutoff accuracy score for the bottom 12.5%. Round answer to two decimal places.
z-value = type your answer...
Bottom 12.5% cutoff =
type your answer...