1. Consider the data 1, 5, 6, 6, 7, 8, 8, 9, 11, 20.
(a) Find the mean of this data.
(b) Find the median of this data.
(c) Find the mode(s) of this data.
(d) Find the range of this data.
(e) Create and label a box and whisker plot of this data.
(f) Find the sample standard deviation of this data.
2. Problem 13 on p. 712.
3. Suppose ACT scores in a particular year are approximately normally distributed with mean 20 and standard deviation of 6.
(a) What z value does 29 represent?
(b) Use the table on page 709 to determine the proportion of test-takers that receive a 29 or better on the ACT test.
(c) What ACT score must you get if 69.15% of test-takers received a higher score?
4. An American Research Group poll of a nationwide random sample of 2,104 likely voters was conducted by telephone March 2-5, 2007. It showed Clinton at 42% support and McCain at 45% (with 10% Undecided). Determine a 95% confidence interval for the 45% McCain figure. Show how you compute your answer.
5. Problem 27 on p. 741.