solutions_-_probability__stats_review_a1.pdf

# B find the interquartile range a 6 30 24 c find the

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b. Find the interquartile range. A*-6, 30-24 c. Find the mean of the d. Find the standard deviation. -,* ST. 2 - /5Iv7tr * €>.<ypf 10. A set of values has a mean of 72 and a standard deviation of 6.5. Find the 2r-score of the value 87? - _ ^i u»s 11. A set of values has a mean of 180 and a standard deviation of 32. What value has a z-score of' 1 - 8 ? _!,%=. y-180 -^"7.6»'X- 12. A data set has a z-score of 2.5 for the value 125 and a mean of 110. Find the standard deviation. 0 13. Identify the type of sampling and any possible biases in each scenario. a) A record label wants to test three designs for an album cover. They randomly select 50 teenagers from local high schools to view the covers while they watch and record their actions. b) A shopping mall wants to know if they should put a movie theater in the mall. Every hour, the mall manager questions 20 of the people coming into the mall. V JAO c) The city council wants to start a recycling program. They send out a questionnaire to 200 random citizens asking what items they would recycle. ar/..

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For each sample find A) the sample proportion. B) the margin of error, and C) an interval likely to contain the true population proportion. (To the nearest tenth of a %). 14. In a survey of 64 parents of preschool children, 18 would like to have their local school district provide play group sessions at least one evening a month. 2^*1 ±.12 15. In a random sample of 842 visitors to the art museum, 378 want the museum to be open later in the evenings. ^ \. In a survey of 322 visitors to the zoo, 238 want the zoo to 17. What sample size would be needed for a margin of error of l 18. a) The length of human pregnancies from conception to birth approximates a normal distribution with a mean of 266 days and a standard deviation of 16 days. Sketch
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