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Chapter 12: Q13. (page 737)
Write each fraction as a percent. Round to the nearest tenth.
The fraction as a percent is .
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To predict whether or not an issue on a ballot will pass or fail, a committee randomly calls 250 houses with area codes that are inside the voting district and asks the opinions of registered voters. Based on these efforts, the committee determines that of the voting population supports the issue. The committee concludes that the issue will pass.
a. Identify the sample.
b. Describe the population.
c. What method of data collection did the committee use: survey, experiment, or observational survey? Explain.
d. Is the sample biased or unbiased. Explain.
e. If unbiased, classify the same as simple, stratified, or systematic. Explain.
Which measure of central tendency best represents the data? Justify your answer. Then find the measure.
The cafeteria wants to show the best representation of how much students spend on lunch: 2, 3, 4, 3, 2, 4, 1, 3, 4, 2, 3, 3, 4, 3.
Find the mean, variance, and standard deviation to the nearest tenth for the set of data.
10, 11, 11, 10, 12, 13, 14, 10
Identify the sample, and suggest a population from which it was selected. Then classify the sample as simple, stratified, or systematic. Explain your reasoning.
A nostalgia television network wants to conduct a cartoon marathon. To choose the episodes, they mail a questionnaire to people selected at random throughout the country.
Which measure of central tendency best represents the data? Justify your answer. Then find the measure.
VOTING The polling place kept a list of all the ages of the people who voted:
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