Sunscreen Use. Industry Research polled teenagers on sunscreen use. The survey revealed that 46% of teenage girls and 30% of teenage boys regularly use sunscreen before going out in the sun. a. identify the specified attribute. b. identify the two populations. c. Are the proportions 0.46 (46%) and 0.30 (30%) sample proportions or population proportions? Explain your answer.

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Q: What is the mean for the following sample of scores? Scores: 2, 4, 5, 9

A:

Q: Find the mode(s) for the given sample data. 20 31 46 31 49 31 49

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Q: Group the data and hence determine A. The sample mean B. The sample median C. The sample mode.

A: Frequency Table Class Count 47-48 5 49-50 8 51-52 18 53-54 5 55-56 2 57-58 3 59-60 1

Q: A sample was done, collecting the data below. Calc 10 22 28 14

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Q: For the exam scores. Class MT1 MT2 Sample size, n 14 13 Mean scores 75.3 826

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Q: 40. What is the degree of freedom in a set of data if the sample size is 197 A. 17 B. 18 C. 19 D. 20

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Q: Find the range for the following sample data: 23 20 15 35 26

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Q: our population? W

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Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.