Question 1
Solve the problem. Round your answer to one decimal place, if necessary.
A random sample of 30 households was selected from a particular neighborhood. The number of cars for each household is shown below. Find the 95% confidence interval for the mean number of cars per household for the population of households in this neighborhood.
◦ 1.2 cars < μ < 2 cars
◦ 1 car < μ < 2 cars
◦ 1.5 cars < μ < 1.9 cars
◦ 1.1 cars < μ < 1.7 cars
Question 2
Solve the problem. Round your answer to one decimal place, if necessary.
A random sample of 30 long distance runners aged 20-25 was selected from a running club. The resting heart rates (in beats per minute) of the runners are shown below. Find the 95% confidence interval for the mean resting heart rate for the population of long distance runners aged 20-25.
◦ 64.9 beats per minute < μ < 70.9 beats per minute
◦ 64.1 beats per minute < μ < 70.1 beats per minute
◦ 64.6 beats per minute < μ < 71.6 beats per minute
◦ 63.7 beats per minute < μ < 72.2 beats per minute
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Problem
Sample Size Affects Sampling Error