4. A resort employs 3,500 managers and staff. To ascertain their employees' opinions of a proposed
health insurance plan, 350 employees are surveyed at random. The proportion of the 350 employees
who favor the health insurance plan represents a parameter in this scenario.
6. 35% of a sample of 300 professional baseball players indicated that their parents did not play baseball.
Based on this sample, we estimate that approximately 35% of the parents of all professional baseball
players did not play baseball, plus or minus 5%. This is an example of using inferential statistics.
12. You take a random sample to estimate a population mean and your results have a confidence level of
80%. That means the process you used will give you correct results 80% of the time.
1. A random sample of 100 students is taken at LearnAll University and it’s found that their average GPA
is 3.1. If this information is used to help estimate the average GPA for all students at LearnAll
University, which branch of statistics was applied?
a. Descriptive statistics c. Sample statistics
b. Inferential statistics d. Population statistics
2. A company has developed a new computer microprocessor whose average lifetime is unknown. In
order to estimate this average, 300 microprocessors are randomly selected from a large production line
and tested; their average lifetime is found to be 7 years. The 300 microprocessors represent a:
a. parameter. c. sample.
b. statistic. d. population.
3. A company has developed a new engine whose average lifetime is unknown. In order to estimate this
average, 100 engines are randomly selected from a large production line and tested; their average
lifetime is found to be 11 years. The 11 years represents a:
a. parameter. c. sample.
b. statistic. d. population.
6. Which of the following is a measure of the reliability of a statistical inference?
a. A population parameter. c. A descriptive statistic.
b. A significance level. d. A sample statistic.
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