Statements for #5. I. In all normal distributions, the mean and median are equal. II. All bell-shaped curves are normal distribution for some choices of and . III. Virtually all area under a normal curve is within three standard deviations of the mean, no matter what the particular mean and standard deviations are.

5. Which of the above statements are true statements?

A. I and II

B. I and III

C. II and III

D. I, II and III

6. A new type of reaction catalyst was invented which would speed up the fermentation process in beverage production. A test will be conducted focusing on showcasing the improved ability of this new catalyst vs an old formulation. What kind of test must be conducted?

A. One-tailed: _new > _old

B. One-tailed: _new < _old

C. Two-tailed: _new _old

D. Not enough information

7. What type of statistical test should be used when the population is approximately normally distributed and the population standard deviation is unknown.

A. Z- test

B. T-test

C. F -test

D. Test for proportion

8. Listed below are the statistical distributions that rely on the number of degrees of freedom of the dataset, EXCEPT:

A. Standard Normal (z) distribution

B. Chi-Square distribution

C. F distribution

D. t Distribution