Question:

A baseball coach was curious about the true mean speed of fastball pitches in his league. The coach recorded the speed in kilometers per hour of each fastball in a random sample of 100 pitches and constructed a 95% confidence interval for the mean speed. The resulting interval was (110,120). Which statement is a correct interpretation of the confidence interval? Choose all answers that apply: O a) About 95% of pitches in the sample were between 110 and 120 km/ hr. C] b) If the coach took another sample of 100 pitches, there's a 95% chance the sample mean would be between 110 and 120 km/hr. O c) We are 95% confident that the interval (110,120) captured the true mean pitch speed. C] d) If the baseball coach repeats this process and constructs 20 intervals from separate independent samples, we can expect about 19 of those intervals to contain the true mean speed of fastball pitches in his league