A doctor is measuring the average height of male students at a large college. The doctor measures the heights, in inches, of a sample of 40 male students from the baseball team. Using this data, the doctor calculates the 95% confidence interval (63.5, 74.4).

Which one of the following conclusions is valid?

A. No conclusion can be drawn.

B. The doctor can be 95% confident that the mean height of male students at the college is between 63.5 inches and 74.4 inches.

C. 95% of the male students from the baseball team have heights between 63.5 inches and 74.4 inchs

A marketing student is estimating the average amount of money that students at a large university spent on sporting events last year. He asks a random sample of 50 students at one of the university football games how much they spent on sporting events last year. Using this data he computes a 90% confidence interval, which turns out to be ($217, $677).

Which one of the following conclusions is valid?

A. 90% of the sample said they spent between $217 and $677 at sporting events last year.

B. We can be 90% confident that the mean amount of money spent at sporting events last year by all the students at this university is between $217 and $677.

C. No conclusion can be drawn.