Question

1. Copy and paste a 92% confidence interval for the mean mileage/size of all automobiles/homes/apartments from model/location 3 in the space provided. Answer the following questions regarding this printout:

Variable N Lo 92% CI Up 92% CI

Mileage 25 20895    35709     

What assumptions are necessary for this confidence interval to be valid? Make sure you use the words of the problem when stating these assumptions.

2. Pick the claim based on your data set:

            The mean mileage of all automobiles is 30,000 miles.

            The mean size of all homes is 2,000 square feet.

            The mean size of all apartments is 1,000 square feet.

Based on the interval you created, make a statement regarding my claim.

Answer 1

1. The one-sample t-test has four main assumptions:

• • The model/location must be continuous (interval/ratio).
• • The mean mileage/size of all automobiles/homes/apartments are independent of one another.
• • The model/location should be approximately normally distributed.
• • The model/location should not contain any outliers.

2. Claim: The mean mileage of all automobiles is 30,000 miles.

Since the confidence interval contains 30,000 miles, we can conclude that the mean mileage of all automobiles is 30,000 miles.