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S CIENCE OF L EARNING FROM D ATA THIRD
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EDITION Alan Agresti Christine Franklin
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Answers At The End Of Each Chapter
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,Chapter 1 Exam A
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Name
MULTIPLE CHOICE. Choose the one alternative that best completes the statement
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or answers the question.
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Answer true or false. b b b
1) One method of learning about the impact of randomness and variability
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from sample to sample is simulation.
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A) True B) False b
Provide an appropriate response.
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2) A survey of 1500 American households found that 33% of the
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respondents own a computer. Is this value a parameter or a statistic?
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A) statistic B) parameter b
SHORT ANSWER. Write the word or phrase that best completes each statement or
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answers the question.
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Fill in the blank.
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3) The three main aspects of statistics are ,
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and b
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.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement
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or answers the question.
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Answer true or false. b b b
4) A large company would like to know what percentage of itʹs employees
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would utilize an on -site daycare facility. Rather than asking itʹs 5000
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employees, each employee is assigned a number from 1 to 5000 and
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then a computer program is used to randomly select 100 numbers
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between 1 and 5000. These employees are then contacted and asked
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whether they would use an on -site daycare facility. The method used
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to collect the sample of 100 responses produces a random sample.
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A) False B) True b
SHORT ANSWER. Write the word or phrase that best completes each statement or
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,b answers the question.
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Fill in the blank.
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5) The basis of bis that each subject in the population
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has the same chance of being in the sample.
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MULTIPLE CHOICE. Choose the one alternative that best completes the statement
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or answers the question.
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Answer true or false.
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6) Descriptive statistics refers to methods of making decisions or
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predictions about a population, based on data obtained from a sample
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of that population; while inferential statistics refers to methods for
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summarizing the data.
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A) True B) False b
, SHORT ANSWER. Write the word or phrase that best completes each statement or
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answers the question.
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Provide an appropriate response.
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7) Drug X, a drug that claims to treat male pattern scalp hair loss,
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was administered for 12 months to over 1800 men aged 18 to 41
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with mild to moderate amounts of ongoing hair loss. Whether
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they were receiving drug X or a placebo (a pill containing no
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medication), all men were given a medicated shampoo. In
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general, men who took drug X maintained or increased the
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number of visible scalp hairs; while scalp hair counts in men who
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took the placebo continued to decrease. This concluded that drug
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X is effective in maintaining or increasing the amount of scalp hair
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in men. Which statement of this example can be referred to as
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descriptive statistics?
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8) A recent poll asked 1,245 registered voters nationwide, ʺWhich
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8) b
party do you think can do a better job of handling immigration
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issues?ʺ 31% of the respondents answered ʺRepublicans.ʺ With a
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margin of error of ±3%, it is estimated that between 28 and 34
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bpercent of registered voters nationwide feel that the Republican
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party can do a better job of handling immigration issues.
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bIdentify which part of this example is inferential.
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9) Every year the U.S. Census Bureau releases the Current Population
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Report based on a survey of 50,000 households within the United
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States. Identify the population, the sample, and the subjects for
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this study.
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MULTIPLE CHOICE. Choose the one alternative that best completes the statement
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or answers the question.
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Select the most appropriate answer.
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10) A short application program for performing a
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specific task is called a/an
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A) time series. b
B) parameter.
C) applet.
D) None of these. b b
E) sampling.
Answer true or false.
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