Questions 5-7 are based on the following: A recent study found that 80% of teenagers use...
| Questions 5-7 are based on the following: | ||||||||||
| A recent study found that 80% of teenagers use cell phones while driving. Treat this figure as the population proportion. | ||||||||||
| 5 | What is the probability that in a random sample of 450 teenagers, 369 use cell phones while driving ? | |||||||||
| a | 0.1924 | |||||||||
| b | 0.1749 | |||||||||
| c | 0.1590 | |||||||||
| d | 0.1446 | |||||||||
| 6 | In repeated random samples of size n = 450, the fraction of sample proportions that fall within ±0.03 (3 percentage points) from the population proportion is, | |||||||||
| a | 0.8882 | |||||||||
| b | 0.8349 | |||||||||
| c | 0.8015 | |||||||||
| d | 0.7695 | |||||||||
| 7 | The upper end of the middle interval that includes 95% of all proportions from samples of size n = 450 is, | |||||||||
| a | 0.915 | |||||||||
| b | 0.888 | |||||||||
| c | 0.862 | |||||||||
| d | 0.837 | |||||||||
Homework Answers
Solution:
5. What is the probability that in a random sample of 450 teenagers, 369 use cell phones while driving ?
Answer: d. 0.1446
6. In repeated random samples of size n = 450, the fraction of sample proportions that fall within ±0.03 (3 percentage points) from the population proportion is,
Answer: a. 0.8882
7. The upper end of the middle interval that includes 95% of all proportions from samples of size n = 450 is,
Answer: d. 0.837
Add Answer to:
Questions 5-7 are based on the following:
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lots of parts please help! Researchers wondered if there was a difference between male and females...
lots of parts please help!
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lots of parts please help!
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