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Chapter 18 Homework Problems
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Chapter 18 Homework Problems
(18.02) A survey of licensed drivers inquired about running red lights. One question asked, "Of every ten motorists who run a red light, about how many do you think will be
caught? The mean result for 943 respondents was I = 2.11 and the standard deviation was s = 1.94. For this large sample, s will be dose to the population standard deviation
5, so suppose we know that s = 1.94
Give a 95% confidence interval (0.01) for the mean opinion in the population of all licensed drivers:
The distribution of responses is skewed to the right rather than Normal. Will it strongly affect the z confidence interval for this sample?
- Yes
• No
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