WHAT IS STATISTICS? MULTIPLE CHOICE 1. You take a random sample of 100 students at your university and find that their average GPA is 3.1. If you use this information to help you estimate the average GPA for all students at your university, then you are doing what branch of statistics? a. Descriptive statistics b. Inferential statistics c. Sample statistics d. Population statistics ANS: B 2. A company has developed a new computer sound card whose average lifetime is unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. The 200 sound cards represent a: a. parameter. b. statistic. c. sample. d. population. ANS: C 3. A company has developed a new computer sound card whose average lifetime is unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. The 5 years represents a: a. parameter. b. statistic. c. sample. d. population. ANS: B 4. A descriptive measure that is computed from a sample is called a: a. parameter. b. statistic. c. population. d. sample. ANS: B 5. A summary measure that is computed from a population is called a: a. sample. b. statistic. c. population. d. parameter. ANS: D 6. Which of the following is a measure of the reliability of a statistical inference? a. A population parameter.
WHAT IS STATISTICS? MULTIPLE CHOICE 1. You take a random sample of 100 students at your university and find that their average GPA is 3.1. If you use this information to help you estimate the average GPA for all students at your university, then you are doing what branch of statistics? a. Descriptive statistics b. Inferential statistics c. Sample statistics d. Population statistics ANS: B 2. A company has developed a new computer sound card whose average lifetime is unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. The 200 sound cards represent a: a. parameter. b. statistic. c. sample. d. population. ANS: C 3. A company has developed a new computer sound card whose average lifetime is unknown. In order to estimate this average, 200 sound cards are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. The 5 years represents a: a. parameter. b. statistic. c. sample. d. population. ANS: B 4. A descriptive measure that is computed from a sample is called a: a. parameter. b. statistic. c. population. d. sample. ANS: B 5. A summary measure that is computed from a population is called a: a. sample. b. statistic. c. population. d. parameter. ANS: D 6. Which of the following is a measure of the reliability of a statistical inference? a. A population parameter.