ACTM โ Statistics
Questions 1 โ 25 are multiple-choice items. Record your answer on the answer sheet provided. When you have completed the
multiple choice items, then answer each of the three tie-breaker items in order. Record your answer and your work on the tie-
breaker pages provided as part of the test booklet. When you finish, detach the tie breaker items from the booklet, be sure your
name is on each page. When time is called, turn in the answer sheet and the tie-breaker items. You may keep the question part
of the test booklet.
1. Given IQ scores are approximately normally distributed with a mean of 100 and standard
deviation of 15, the proportion of people with IQs above 130 is:
a. 95%
b. 68%
c. 5%
d. 2.5%
2. Randomly assigning treatment to experimental units allows:
a. population inference
b. causal inference
c. both types of inference
d. neither type of inference
3. Failing to reject the null hypothesis when it is false is:
a. alpha
b. Type I error
c. beta
d. Type II error
4. A parameter is:
a. a sample characteristic
b. a population characteristic
c. unknown
d. normal normally distributed
5. A statistic is:
a. a sample characteristic
b. a population characteristic
c. unknown
d. normally distributed
6. Observational studies allow:
a. population inference
b. causal inference
c. both types of inference
d. neither type of inference
