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 schoolaged 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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 Winter '08
 Gunderson
 Statistics, Simple random sample, School bus, a. b. c., Lab Section Number

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