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5. Sampling Method What type of sampling best describes the way in which the 717 sub- jects were chosen: simple random sample, systematic sample, convenience sample, stratified sample, cluster sample? Does the method of sampling appear to adversely affect the quality of the results? hearvational study?
5. Sampling Method What type of sampling best describes the way in which the 717 sub- jects were chosen: simple random sample, systematic sample, convenience sample, stratified sample, cluster sample? Does the method of sampling appear to adversely affect the quality of the results? hearvational study?
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The following table is a summary of a random sample from all individuals who were first
elected to the U.S. House of Representatives in the Years 1910-1960.
Age at First Election (in years) Number of Congressmen
Age at First Election (in years) | Number of Congressmen |
25 up to but not including 35 | 5 |
35 up to but not including 45 | 40 |
45 up to but not including 55 | 35 |
55 up to but not including 75 | 20 |
(a) What is the data collecting method?
(b) What is the population from which the sample was selected?
(c) What is the variable of interest?
(d) What is the type of this variable?
(e) What is the sample size?
(f) What is the percentage of congressmen who were younger than 45 years when they were first elected?
(g) What is the percentage of congressmen who are 35 years or older when they were first elected?