Question Details

1.      What percent of humans have a pregnancy lasting longer than 280 days?  Sketch and shade.

2.      What percent of humans have a pregnancy lasting between 260 and 270 days?  Sketch and shade.

3.      Would you say pregnancy length is a continuous or discrete variable?  Justify.

4.      You have normal distributions on your TI-83.  Use these functions to check your answers to problems 38, 40, 41, and 42.

5.      How long would a pregnancy have to last to be in the longest 10% of all pregnancies?

6.      How short would a pregnancy be to be in the shortest 25% of all pregnancies?

7.      How long would a pregnancy be to be in the middle fifth of all pregnancies?

8.      Does the vole information from the beginning of this review seem to be normal?  Justify by checking actual percentages within 1, 2, and 3 standard deviations of the mean.

9.      Make a back-to-back split stemplot of the following data:

Reading Scores

4^th Graders             12        15        18        20        20        22        25        26        28        29                                      31        32        35        35        35        36        37        39        40        42

7^th Graders               1        12        15        18        18        20        23        23        24        25                                      27        28        30        30        31        33        33        33        35        36

10.  Make a comparison between 4^th grade and 7^th grade reading scores based on your stemplot.