Question

on a jogging trail, you take a random sample of the speed of 50 joggers and determine that their average speed is 5.3 mph. which statement is true?
a. you conclude that the average speed of all joggers is close to 5.3 mph.
b. you conclude that the speed of all joggers on this trail is exactly 5.3 mph.
c. you conclude that the average speed of all joggers on this trail is close to 5.3 mph.
d. you conclude that the speed of more than half of the joggers on this trail is less than 5.3 mph.

Explanation:

A sample is used to estimate population - level parameters. Here, the sample of 50 joggers' speeds gives an average of 5.3 mph. We can only conclude that the average speed of all joggers on this trail (the population) is close to the sample average. We cannot say it is exactly 5.3 mph, nor can we make claims about the speed of more than half of the joggers based on just the average of the sample.

Answer:

C. You conclude that the average speed of all joggers on this trail is close to 5.3 mph.