Chapter 2: Q 26. (page 108)
Density curves Sketch a density curve that might describe a distribution that has a single peak and is skewed to the left.
Chapter 2: Q 26. (page 108)
Density curves Sketch a density curve that might describe a distribution that has a single peak and is skewed to the left.
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Get started for freeA study recorded the amount of oil recovered from the wells in an oil field. Here are descriptive statistics for that set of data from Minitab
The distribution of heights of young women aged to is approximately
1. Sketch a Normal density curve for the distribution of young women's heights. Label the points one, two, and three standard deviations from the mean.
T2.7. If the heights of American men follow a Normal distribution, and have heights between and , what is your estimate of the standard deviation of the height of American men?
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Each year, about million college-bound high school juniors take the PSAT. In a recent year, the mean score on the Critical Reading test was and the standard deviation was. Nationally, of test takers earned a score of 65 or higher on the Critical Reading testโs to scale.9
PSAT scores Scott was one of junior boys to take the PSAT at his school. He scored on the Critical Reading test. This placed Scott at the 68th percentile within the group of boys. Looking at all boysโ Critical Reading scores, the mean was and the standard deviation was
(a) Write a sentence or two comparing Scottโs percentile among the national group of test-takers and among the boys at his school.
(b) Calculate and compare Scottโs z-score among these same two groups of test-takers.
Lynette, a student in the class, is inches tall. Find and interpret her z-score.
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