Question 1
Use the t distribution to construct the confidence interval estimate of the population mean. Round the confidence interval estimates to one decimal place unless indicated otherwise.
A simple random sample of 30 households was selected from a particular neighborhood. The number of cars for each household is shown below. Construct the 95% confidence interval estimate of the population mean.
◦ 1.5 cars < μ < 1.9 cars
◦ 1.0 cars < μ < 2.0 cars
◦ 1.3 cars < μ < 1.7 cars
◦ 1.1 cars < μ < 1.9 cars
Question 2
Use the t distribution to construct the confidence interval estimate of the population mean. Round the confidence interval estimates to one decimal place unless indicated otherwise.
How tall is your average statistics classmate? To determine this, you measure the height of a simple random sample of 38 fellow students, finding a mean height of 68 inches and a standard deviation of
2.3 inches. Construct the 95% confidence interval estimate of the population mean.
◦ 68.2 in. < μ < 68.8 in.
◦ 67.2 in. < μ < 68.8 in.
◦ 67.2 in. < μ < 69.8 in.
◦ 68.2 in. < μ < 69.8 in.
Abiotic factors influence population densities.
Population Losses in the South, 1920–1930
The Median Age of the U.S. Population
Expected Distribution of IQ Scores
Expected Distribution of IQ Scores
Time vs. USA Population Exponential