Chapter 1: Q2-11BSC (page 1)
Identify whether the given value is a statistic or a parameter.
Titanic A study was conducted of all 2223 passengers aboard the Titanic when it sank.
For a study, the value of 2223 representing the total number of passengers aboard the Titanic is a parameter.
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Statistical Significance and Practical Significance. In Exercises 13–16, determine whether the results appear to have statistical significance, and also determine whether the results appear to have practical significance.
Diet and Exercise Program In a study of the Kingman diet and exercise program, 40 subjects lost an average of 22 pounds. There is about a 1% chance of getting such results with a program that has no effect
In Exercises 29–36, answer the given questions, which are related to percentages.
Chillax USA Today reported results from a Research Now for Keurig survey in which 1458 men and 1543 women were asked this: “In a typical week, how often can you kick back and relax?”
a. Among the women, 19% responded with “rarely, if ever.” What is the exact value that is 19% of the number of women surveyed?
b. Could the result from part (a) be the actual number of women who responded with “rarely, if ever”? Why or why not?
c. What is the actual number of women who responded with “rarely, if ever”?
d. Among the men who responded, 219 responded with “rarely, if ever.” What is the percentage of men who responded with “rarely, if ever.”?
e. Consider the question that the subjects were asked. Is that question clear and unambiguous so that all respondents will interpret the question the same way? How might the survey be improved?
In Exercises 21–24, refer to the data in the table below. The entries are white blood cell counts (1000 cells,ML) and red blood cell counts (million cells,ML) from male subjects examined as part of a large health study conducted by the National Center for Health Statistics. The data are matched, so that the first subject has a white blood cell count of 8.7 and a red blood cell count of 4.91, and so on.
Subject
| 1 | 2 | 3 | 4 | 5 | |
| White | 8.7 | 5.9 | 7.3 | 6.2 | 5.9 |
| Red | 4.91 | 5.59 | 4.44 | 4.8 | 5.17 |
Context Given that the data are matched and considering the units of the data, does it make sense to use the difference between each white blood cell count and the corresponding red blood cell count? Why or why not?
Identify whether the given value is a statistic or a parameter.
Periodic table The average (mean) atomic weight of all elements in the periodic table is 134.355 unified atomic mass units.
In Exercises 29–36, answer the given questions, which are related to percentages.
Percentages in Advertising: An ad for Big Skinny wallets included the statement that one of their wallets “reduces your filled wallet size by 50%–200%.” What is wrong with this statement?
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