QUESTION 1

1. The research department of a particular solar manufacturer believes that the mean energy output of their solar panels is 227 Watts. A random sample of 25 solar panels were tested and the average energy output was 225.5 Watts. It is known that the standard deviation of energy output for the panels the manufacturer produces is 2.5 Watts. A test is carried out to determine if the average energy output of the manufactured panels is different from 227 Watts. What is the p-value for this test?
2. a.0.4987
3. b.0.0013
4. c.0.0026
5. d.0.9974

1 points

QUESTION 2

1. Which of the following is TRUE?
2. The p-value for a two tail test is less than the p-value for the corresponding one tail test.
3. The calculated p-value should be divided by 2 to make the decision for a two tail test.
4. The calculated p-value should be compared with the selected level of significance divided by 2 (a/2) to make the decision for a two tail test.
5. None of the above.

1 points

QUESTION 3

1. Which of the following statements concerning regression and correlation analysis is/are FALSE?
3. A. A negative correlation coefficient would be anticipated for the relationship between the unit price and total quantity purchased of wine.
4. B. In simple linear regression, the choice of which variable is the dependent and which is the independent variable doesn't matter.
5. C. If two variables displayed a perfect negative linear relationship, then regressing one variable on the other would yield a coefficient of determination of one.
6. only Bonly Conly A and Bonly B and Call three statements are true

3 points

QUESTION 4

1. The Maroochy Chamber of Commerce is interested in determining the relationship between the number of fine days each year and the number of interstate and overseas tourists visiting the Sunshine Coast each year, measured in thousands. Using annual data from 1993 to 2005 (inclusive), the following model was estimated: Y = -5.55 +0.5 X
3. Error sum ofsquares:377.5Sum of squares of X: 967
5. Determine the upper limit for the90% confidence interval for the slope correct totwo decimal places.