SOLUTION: 1. A local police department attempted to estimate the average rate of speed (μ) of vehicles along a strip of Main Street. With hidden radar, the speed of a random selection

Algebra ->  Probability-and-statistics -> SOLUTION: 1. A local police department attempted to estimate the average rate of speed (μ) of vehicles along a strip of Main Street. With hidden radar, the speed of a random selection       Log On


   

Question 727215: 1. A local police department attempted to estimate the average rate of speed (μ) of vehicles along a strip of Main Street. With hidden radar, the speed of a random selection of 25 vehicles was measured, which yielded a sample mean of 42 mph and a standard deviation of 6 mph.
a. Estimate the standard error of the mean.
b. Find the 95% confidence interval for the population mean
2. To determine the views of students at a particular college about campus security, an 11-point attitude scale was administered to a random sample of 40 students. This survey yielded a sample mean of 6 (the higher the score, the higher the perceived effectiveness of security measures) and a standard deviation of 1.5.
a. Estimate the standard error of the mean.
b. Find the 95% confidence interval for the population mean.
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