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Exam 1: Introduction to Statistics

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Question 31

Multiple Choice

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which of these types of sampling is used -A researcher interviews 19 work colleagues who work in his building.

A) Systematic
B) Cluster
C) Convenience
D) Stratified
E) Random

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Question 32

Multiple Choice

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which of these types of sampling is used -A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers.

A) Cluster
B) Random
C) Systematic
D) Stratified
E) Convenience

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Question 33

Multiple Choice

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which of these types of sampling is used -An education researcher randomly selects 48 middle schools and interviews all the teachers at each school.

Determine which of the four levels of measurement is most appropriate. -Ages of survey respondents.

Perform the requested conversions. Round decimals to the nearest thousandth and percents to the nearest tenth of a percent, if necessary. -Convert 1.1 to an equivalent fraction and percent.

Determine which of the four levels of measurement is most appropriate. -Amount of fat (in grams) in cookies.

Provide an appropriate response. -Explain what is meant by the term "confounding" and give an example of an experiment in which confounding is likely to be a problem.

Determine which of the four levels of measurement is most appropriate. -A T.V. show's executives raised the fee for commercials following a report that the show received a "No. 1" rating in a survey of viewers.

Use critical thinking to address the key issue. -100,000 randomly selected adults were asked whether they drink at least 48 oz of water each day and only 45% said yes.

Determine which of the four levels of measurement is most appropriate. -On a test, Shoshana got 65% or 39 of the items correct. How many items were on the test?

Identify the number -The height of 2-year-old maple tree is 28.3 ft.

Determine which of the four levels of measurement is most appropriate. -The total number of phone calls a sales representative makes in a month is 425.

which of these types of sampling is used -To avoid working late, a quality control analyst simply inspects the first 100 items produced in a day.

Provide an appropriate response. -Distinguish between qualitative and quantitative data. Give an example for each.

Solve the problem. -A gardener has 56 clients, 50% of whom are businesses. Find the number of business clients.

Determine which of the four levels of measurement is most appropriate. -A stock analyst selects a stock from a group of twenty for investment by choosing the stock with the greatest earnings per share reported for the last quarter.

Provide an appropriate response. -List five different abuses of statistics and give examples for each.

Provide an appropriate response. -Define random sample. Explain why this is important in design of experiments.

which of these types of sampling is used -The name of each contestant is written on a separate card, the cards are placed in a bag, and three names are picked from the bag.

Provide an appropriate response. -Define and give examples for nominal, ordinal, interval, and ratio levels of measurement. Describe the type of statistics which might be reported for each.