Statistics 10 Multiple Choice question Quiz

1. What can be claimed regarding a perfectly normal distribution?

a. Mean = Mode

b. Median = Mode

c. Mean = Median

d. All of the above

2. The price-to-earning ratio for companies in a specific industry is normally distributed. In this industry, what can be concluded regarding a company with a price-to-earning z-score equal to 0?

a. The company's price-to-earning ratio is above average.

b. The company's price-to-earning ratio is below average.

c. The company's price-to-earning ratio is average.

d. Nothing can be concluded regarding the company's price-to-earning ratio.

3. What is the mean and standard deviation of a standard normal curve?

a. 0, 0

b. 0, 1

c. 1, 0

d. 1, 1

4. Assume the age of students in your class is normally distributed with a mean of 30 years and a standard deviation of 5 years. What is the probability that the age of a randomly selected student from your class would be more than 35?

a. 84.1%

b. 68.2%

c. 47.7%

d. 15.9%

5. A student's score on a quiz was transformed to a z-score of - 1. What can be concluded regarding the student's score?

a. above average

b. 84.1% of the class scored higher on the quiz

c. 68.2% of the class scored higher on the quiz

d. 49.85% of the class scored higher on the quiz

6. The price-to-earning ratio for companies in a specific industry is normally distributed. What is the probability that a randomly selected company from this industry has a price-to-earning ratio between the industry mean and one standard deviation above this mean?

a. 68.2%

b. 34.1%

c. 13.6%

d. 2.15%

7. What is the mean and standard deviation of a distribution of T-scores?

a. 50, 0

b. 50, 1

c. 50, 10

d. 50, 21.06

8. What percent of scores fall between the mean and plus three standard deviations in a standard normal curve?

a. 34.1%

b. 13.6%

c. 49.85%

d. 68.2%

9. What percent of scores fall between minus one standard deviation and plus one standard deviation in a standard normal curve?

a. 34.1%

b. 13.6%

c. 49.85%

d. 68.2%

10. What percent of scores fall between the mean and negative one standard deviation in a distribution of T-scores?

a. 34.1%

b. 13.6%

c. 49.85%

d. 68.2%