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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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off chemical changes in the atmosphere that result in acid rain. The acidity of liquids measured by CH
te acidity Normal rains somewhat acide. So acid rain is sometimes defined as rantall with a pH belo5
adian forest to Normal distribution with standard deviation S 0.5A sample of days the
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