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Chapter 3: Q1 (page 127)
Sleep Mean As part of the National Health and Nutrition Examination Survey, subjects were asked how long they slept the preceding night, and the following times (hours) were reported: 8, 7, 5, 7, 4, 7, 6, 7, 8, 8, 8, 6. Find the mean.
The mean duration is 6.8 hours.
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In Exercises 13鈥�16, use z scores to compare the given values.
Birth Weights Based on Data Set 4 鈥淏irths鈥� in Appendix B,newbornmales have weights with a mean of 3272.8 g and a standard deviation of 660.2 g.Newbornfemales have weights with a mean of 3037.1 g and a standard deviation of 706.3 g. Who has the weight that is more extreme relative to the group from which they came: a male who weighs 1500 g or a female who weighs 1500 g?
:In Exercises 5鈥�20, find the range, variance, and standard deviation for the given sample data. Include appropriate units (such as 鈥渕inutes鈥�) in your results. (The same data were used in Section 3-1, where we found measures of center. Here we find measures of variation.) Then answer the given questions.
Most Expensive Colleges Listed below in dollars are the annual costs of tuition and fees at the 10 most expensive colleges in the United States for a recent year (based on data from U.S. News & World Report). The colleges listed in order are Columbia, Vassar, Trinity, George Washington, Carnegie Mellon, Wesleyan, Tulane, Bucknell, Oberlin, and Union. What does this 鈥渢op 10鈥� list tell us about the variation among costs for the population of all U.S. college tuitions?
49,138 47,890 47,510 47,343 46,962 46,944 46,930 46,902 46,870 46,785
Measures of Center In what sense are the mean, median, mode, and midrange measures of 鈥渃enter鈥�?
In Exercises 33鈥�36, use the range rule of thumb to identify the limits separating values that are significantly low or significantly high
Pulse Rates of Males Based on Data Set 1 鈥淏ody Data鈥� in Appendix B, males have pulse rates with a mean of 69.6 beats per minute and a standard deviation of 11.3 beats per minute. Is a pulse rate of 50 beats per minute significantly low or significantly high? (All of these pulse rates are measured at rest.) Explain.
In Exercises 5鈥�20, find the range, variance, and standard deviation for the given sample data. Include appropriate units (such as 鈥渕inutes鈥�) in your results. (The same data were used in Section 3-1, where we found measures of center. Here we find measures of variation.) Then answer the given questions.
Football Player Weights Listed below are the weights in pounds of 11 players randomly selected from the roster of the Seattle Seahawks when they won Super Bowl XLVIII (the same players from the preceding exercise). Are the measures of variation likely to be typical of all NFL players?
189 254 235 225 190 305 195 202 190 252 305
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