A random sample of 100 vehicles traveling on a rural section of highway had a mean speed of 62 miles per hour. Assume the population standard deviation is 7 miles per hour. Find a 95% confidence interval for the vehicle speed of all cars traveling on this section of the highway. a) 60.6-63.4 b) 60.8-63.2 c) 50.5-73.5 d) 62
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We are given the sample mean ($\bar{x}$) = 62 mph, the population standard deviation ($\sigma$) = 7 mph, and the sample size (n) = 100. Show more…
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