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Chapter 2: Q. 1.3 (page 114)
3. What percent of young women have heights between 62 and 72 inches? Show your work.
The percentage young women have heights between 62 and 72 inches are
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About what percent of calls lasted less than minutes? minutes or more?
Use Table A to 铿乶d the proportion of observations from the standard Normal distribution that satis铿乪s each of the following statements. In each case, sketch a standard Normal curve and shade the area under the curve that is the answer to the question. Use your calculator or the Normal Curve applet to check your answers.
More Table A practice
(a) is between 鈭�and
(b) is between and
The proportion of observations from a standard Normal distribution with values less than is
(a) .
(b) .
(c) .
(d) .
(e) none of these.
T2.2. For the Normal distribution shown, the standard deviation is closest to
(a) 0
(b) 1
(c) 2
(d) 4
(e) 5
R2.4 Aussie, Aussie, Aussie A group of Australian students were asked to estimate the width of their classroom in feet. Use the dot plot and summary statistics below to answer the following questions.
(a) Suppose we converted each student's guess from feet to meters . How would the shape of the distribution be affected? Find the mean, median, standard deviation, and IQR for the transformed data.
(b) The actual width of the room was feet. Suppose we calculated the error in each student's guess as follows: guess . Find the mean and standard deviation of the errors. How good were the students' guesses? Justify your answer.
Approximately locate the median (equal-areas point) and the mean (balance point) on a density curve.
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