ALC 9 PRETEST QUESTIONS & ANSWERS LATEST UPDATE
1. A company has developed a new smartphone whose average lifetime is unknown. In order to estimate this average, 200 smartphones are randomly selected from a large production line and tested; their average lifetime is found to be 5 years. Th...
1. A company has developed a new smartphone whose average lifetime is unknown. In
order to estimate this average, 200 smartphones are randomly selected from a large
production line and tested; their average lifetime is found to be 5 years. The 200
smartphones represent a .
a. parameter
b. statistic
c. sample
d. population
2. Which of the following is a measure of the reliability of a statistical inference?
a. A population parameter
b. A significance level
c. A descriptive statistic
d. A sample statistic
3. The process of using sample statistics to draw conclusions about population parameters
is called .
a. finding the significance level
b. calculating descriptive statistics
c. doing inferential statistics
d. calculating the confidence level
4. Which of the following statements involve descriptive statistics as opposed to inferential
statistics?
a. The Alcohol, Tobacco and Firearms Department reported that Houston had
1,791 registered gun dealers in 1997.
b. Based on a survey of 400 magazine readers, the magazine reports that 45% of its
readers prefer double column articles.
c. The FAA samples 500 traffic controllers in order to estimate the percent retiring
due to job stress related illness.
d. Based on a sample of 300 professional tennis players, a tennis magazine
reported that 25% of the parents of all professional tennis players did not play
tennis.
5. A population of all college applicants exists who have taken the SAT exam in the
United States in the last year. A parameter of the population are .
a. students who completed the SAT exam
b. college applicants
c. U.S. college applicants in the last year
d. SAT scores
6. Which of the following statements is true regarding the design of a good survey?
a. The questions should be made as long as possible
b. A mixture of dichotomous, multiple-choice, and open-ended questions may not
be used
c. Leading questions must be used
d. The questions should be kept as short as possible
7. Which method of data collection is involved when a researcher counts and records the
number of students wearing backpacks on campus on a given day?
, a. An experiment
b. A survey
c. Direct observation
d. Interview
8. The manager of the customer service division of a major consumer electronics company
is interested in determining whether the customers who have purchased a videocassette
recorder over the past 12 months are satisfied with their products. If there are four
different brands of videocassette recorders made by the company, the best sampling
strategy would be to use a .
a. simple random sample
b. stratified random sample
c. cluster sample
d. self-selected sample
9. Which of the following types of samples is almost always biased?
a. Simple random samples
b. Stratified random samples
c. Cluster samples
d. Self-selected samples
10. is an expected error based only on the observations limited to a sample
taken from a population.
a. sampling error
b. response error
c. nonresponse error
d. non-sampling error
11. Bayes's Law is used to compute .
a. prior probabilities
b. joint probabilities
c. union probabilities
d. posterior probabilities
12. The classical approach describes a probability .
a. in terms of the proportion of times an event is observed to occur in a very large
number of trials
b. in terms of the degree to which one happens to believe that an event will
happen
c. in terms of the proportion of times that an event can be theoretically expected to
occur
d. is dependent on the law of large numbers
13. If a set of events includes all the possible outcomes of an experiment, these events are
considered to be .
a. mutually
exclusive b.
exhaustive
c. intersecting
d. inclusive
14. Which of the following statements is not correct?
, a. Two events A and B are mutually exclusive if event A occurs and event B
cannot occur.
b. If events A and B occur at the same time, then A and B intersect.
c. If event A does not occur, then its complement A' will also not occur.
d. A union of events occurs when at least one event in a group occurs, e.g., (A or B
or C).
15. The can determine the union of two events such as event A and event B.
a. multiplication rule
b. Bayes' Law Formula
c. complement rule
d. addition rule
16. The concept that allows us to draw conclusions about the population based strictly on
sample data without having any knowledge about the distribution of the underlying
population is .
a. the central limit theorem
b. standard error of the mean
c. the range
d. the standard deviation
17. Each of the following are characteristics of the sampling distribution of the mean except
.
a. the sampling distribution of the mean has a different mean from the original
population
b. the standard deviation of the sampling distribution of the mean is referred to as
the standard deviation
c. if the original population is not normally distributed, the sampling distribution of
the mean will be normal
d. if the original population is not normally distributed, the sampling distribution of
the mean will also be approximately normal for large sample sizes
18. Suppose you are given 3 numbers that relate to the number of people in a university
student sample. The three numbers are 10, 20, and 30. If the standard deviation is 10,
the standard error equals .
a. 5.77
b. 14.227
c. 8.165
d. 1.732
19. You are tasked with finding the sample standard deviation. You are given 4 numbers.
The numbers are 5, 10, 15, and 20. The sample standard deviation equals .
a. 3.227
b. 12.5
c. 5.59
d. 6.455
20. Two methods exist to create a sampling distribution. One involves using parallel samples
from a population and the other is to use the .
a. Central Limit Theorem
, b. variance
c. rules of probability
d. sampling distribution
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