(b) Q1 = 51, median = 55, Q3 = 58

(c) fairly symmetric

(d) mean = 57.75, sd = 2.31

(e) 31

Problem 2

(a) z = 3.12, area = 0.0009

(b) 0.0018

(c) z = -2.05, x = 247.3

(d) z = +/- 1.15, between 247.41 and 247.59.

Problem 3

(b) There is a weak association.

(c) mean = 34.58, sd = 12.63

(d) (predicted BAC) = 0.2138 - 0.0002*(age in years)

(e) The predicted value is 0.21. Sixteen years is not too far from the observed data,
and the predicted value is a reasonable number.

Problem 4

**False**, the mean would be smaller.

Problem 5

**False**, within one standard deviation.

Problem 6

**True**.

Problem 7

**False**, data with a high correlation may still have a stronger non-linear relationship.

Problem 8

**False**, the slope is positive, but may not be one.

Problem 9

**False**, it indicates a mistaken calculation. -1 <= r <= 1.

Problem 10

**True**.

Problem 11

**False**, association is not causation.

Problem 12

**False**, influential points are usually far away from the mean.