Question

Part 1: The Speed in miles per hour of SIX randomly selected qualifiers for the Indiana 500 (in 2012) are listed below. Estimate the mean qualifying speed with 99% confidence. Round your answers to four decimal places.

223.422 223.684 224.037 225.172 226.240 226.484

Answer 1

Estimate 99% Confidence Interval,

i.e. Confidence level = 0.99, = 0.01

sample size (n) = 6

Degrees of Freedom = n-1 = 6-1 = 5

Critical value:

...............From t table.

Now , We find out 99% Confidence Interval:

(222.6604, 227.0193)

We are 99% Confident that Population mean lies in that Interval.