1 A We are interested in analyzing the average tuition costs

1.

A) We are interested in analyzing the average tuition costs for universities. A random sample of 13 universities was taken and it was found that the average tuition cost is $38,453. The sample had a standard deviation of $9676. Construct a 90% confidence interval for the average tuition cost of all universities.

B) 44% of people in America own a dog. Suppose we take a sample of 60 people. Find the 95% confidence interval for the proportion of people who own a dog.

Solution