23. Harris Interactive conducted a poll of American adults to study the use of online medical information of the 1019 ra

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23 Harris Interactive Conducted A Poll Of American Adults To Study The Use Of Online Medical Information Of The 1019 Ra 1 (50.27 KiB) Viewed 28 times

23. Harris Interactive conducted a poll of American adults to study the use of online medical information of the 1019 randomly chosen adults, 60% had used the Internet within the past month to obtain medical information. Use the results of this survey to create an approximate 95% confidence interval estimate for the percentage of all American adults who have used the Internet to obtain medical information in the past month. a) 0.56, 0.64 b) 0.55, 0.65 c) 0.59, 0.61 d) 0.57, 0.63 24. Weekly expenditure of students from two Universities are studied. From population 1. a sample of 75 students is selected with sample mean $204.20 and population variance 90.1. From population 2, a sample of 50 students is selected and the mean is $184.60 with the population variance of 97.7. What is the 95% Confidence Interval for the difference between the two population means? a) 16.12. 23.08 b) 10.12. 25.04 c) 53.49.-14.29 d) 45.25,5.24 25. A sample of 50 observation wells are randomly selected from Canterbury region and it is found that nitrate level in 3 wells exceeds the allowable limit. Of sample of 60 wells in Waikato area 8% of the wells indicate that their nitrate level is over the acceptable limit. Construct a 90% confidence interval for the difference between the two population proportions that exceed the allowable nitrate concentration. a) 0.10, 0.06 b) 0.05, 0,10 c) -0.10.0.06 d) 0.25, 0.15