Wendy used t-distribution to find the confidence interval whereas Cindy used z-distribution for the same problem. Which of the following is true?

O We can't tell as we don't know if we have the population std dev known. O Wendy's Confidence Interval will be wider. O If the Confidence level is the same, then it makes no difference. O Cindy's Confidence Interval will be wider.

The -stat in a completely randomized single-factor ANOVA is the ratio of

O MSTR/MSE O MSE/MST O MSE/MSRT O MST/MSTR

During the last energy crisis, government officials tried to estimate how much gas is typically left in the tank when the car owners decide to refill it. They collected a sample of 9 cars (see the table below) and calculated the mean to be 3 gallons. What will be the upper limit of the 95 Confidence level for the population mean? 1 4 4 5 3 2 3

4

1

O 3.877 Gallons O 4.066 Gallons O 4.087 Gallons O 3.924 Gallons O 5.772 Gallons If you reject the Null at Alpha = 5% then: O You will not reject at Alpha = 6%. O You may reject the Null at Alpha = 6% O You will reject the Null at Alpha = 6%. O Depends on if P-value is less than 5%.