1.Suppose we gather the following sample:

X 32 42 16 27 22 30 12 13 25 23

Using this sample, calculate the upper bound for the 95% confidence interval.

Hint: you'll need to find the critical value for tusing a t-table(Links to an external site.)

Round your answer to four decimal places.

2.Suppose we gather the following sample:

X 27 44 23 14 35 50 36 34 44 34

Using this sample, calculate the lower bound for the 95% confidence interval.

Hint: you'll need to find the critical value for tusing a t-table(Links to an external site.)

Round your answer to four decimal places.

3.The table below shows the number of cars sold last month by seven employees at Concord Motors and their number of years of sales experience.

Experience 1 2 2 4 5 6 8

Sales 8 6 7 14 9 13 10

Management would like to use simple regression analysis to estimate monthly car sales using the number of years of sales experience. Which one of the following statements describes the results of the hypothesis test that the population slope is not equal to zero using alpha = 0.05?