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350examplehwsol

# 350examplehwsol - = = 1000 1 1 n 0.032 or about 3.2 c No in...

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Statistics 350 – Example Homework Solution Name: XXX XXXXXXXXX ID Number: XXXX-XXXXX GSI Name: XXXX XXXXXX Lab Section Number: 0XX DUE: Not to be turned in, but to show the format for a Stat 350 homework worksheet. Write clearly in the spaces provided. Make sure you show all work. Turn in this 1 page. 1. Chapter 1 (pg 9) Exercise 1.1. a. __ The median height is 65 inches. __________________________________ b. __ The range is 71 – 59 = 12 inches. _________________________________ c. __ The shortest 25% of the women are 59 to 63.5 inches. _______ d. __ The interval from 63.5 to 67.5 inches contains 50% of the women. 2. Explain the difference between a population and a sample. A population is a collection of all individuals of items of interest while a sample is a subset of the population of interest. 3. Chapter 1 (pg 10) Exercise 1.12 (Show your work!) a. The population for this survey is … all University of California faculty members in 1995. b. Approximate margin of error =
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Unformatted text preview: = = 1000 1 1 n 0.032 or about 3.2%. c. No, in the sample a slight majority (52%) was in favor, but the margin of error was about 3.2%. Our interval estimate is 52% ± 3.2% Æ 48.8% to 55.2%, and some values are below the 50% level. 4 A simple random sample of 115 parents of school-aged children (either mom or dad) is taken from a large metropolitan area on the East coast to estimate the proportion of parents whom are concerned about the safety of their children on the school bus and agree with the idea that safety belts should be required on school busses. When interviewed, 99 parents in the sample responded that they are very concerned. a. The response variable being measured for this question could be called Concern status regarding safety of children. What type of variable is concern status ? Categorical Quantitative b. What proportion of parents in the sample is concerned about the safety of their children on the school bus? 99/115 = 0.861 or 86.1%...
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