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Chapter 3: Q5 (page 127)
Sleep Outlier If the sleep time of 0 hours is included with the sample data given in Exercise 1, is it an outlier? Why or why not?
Yes, the zero-hour value is an outlier in the dataset.
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In Exercises 17鈥�20, use the following cell phone airport data speeds (Mbps) from Sprint. Find the percentile corresponding to the given data speed.
0.2 0.3 0.3 0.3 0.3 0.3 0.3 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.5 0.6 0.6 0.7 0.8 1.0 1.1 1.1 1.2 1.2 1.6 1.6 2.1 2.1 2.3 2.4 2.5 2.7 2.7 2.7 3.2 3.4 3.6 3.8 4.0 4.0 5.0 5.6 8.2 9.6 10.6 13.0 14.1 15.1 15.2 30.4
9.6 Mbps
Variance The 20 subjects used in Data Set 8 鈥淚Q and Brain Size鈥� in Appendix B have weights with a standard deviation of 20.0414 kg. What is the variance of their weights? Be sure to include the appropriate units with the result.
USA Today published a list consisting of the state tax on each gallon of gas. If we add the 50 state tax amounts and then divide by 50, we get 27.3 cents. Is the value of 27.3 cents the mean amount of state sales tax paid by all U.S. drivers? Why or why not?
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.
TV Prices Listed below are selling prices in dollars of TVs that are 60 inches or larger and rated as a 鈥渂est buy鈥� by Consumer Reports magazine. Are the measures of variation likely to be typical for all TVs that are 60 inches or larger?
1800 1500 1200 1500 1400 1600 1500 950 1600 1150 1500 1750
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 Females Based on Data Set 1 鈥淏ody Data鈥� in Appendix B, females have pulse rates with a mean of 74.0 beats per minute and a standard deviation of 12.5 beats per minute. Is a pulse rate of 44 beats per minute significantly low or significantly high? (All of these pulse rates are measured at rest.)
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