Mathematics, 24.03.2020 17:33 roman2328
The file measles. dat contains data consistent with that obtained in a survey of parents whose children had not been immunized for measles during a recent campaign to immunize all children between the ages of 11 and 15. During the campaign, 7633 children from the 46 schools in the area were immunized; 9962 children whose records showed no previous immunization were not immunized. In a follow-up survey to explore why the children had not been immunized during the campaign, Roberts et al. (1995) sent questionnaires to the parents of a cluster sample of the 9962 children. Ten schools were randomly selected, then a sample of the Mi non immunized children from each school was selected and the parents of those children were sent a questionnaire. Not all parents responded to the questionnaire; you will examine the effects of nonresponse in Exercise 13 of Chapter 8. a Estimate, separately for each school, the percentage of parents who returned a consent form (variable returned ). For this exercise, treat the "no answer" responses (value 9) as not returned. b Using the number of respondents in school i as mi, construct the sampling weight for each observation. c Estimate the overall percentage of parents who received a consent form along with a 95% CI. d How do your estimate and interval in part (c) compare with the results you would have obtained if you had ignored the clustering and analyzed the data as an SRS
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Mathematics, 21.06.2019 18:00
Saline iv fluid bags cost $64.20 for 24, 1000 ml bags from one supplier. a new supplier sells 500 ml bags for $2 each. the hospital uses about 10,000, 1000 ml bags each month. nurses report that about half of the bags are more than half full when they are discarded. if you are going to use only one supplier, which size bag provides the best deal, and how much will you save each month? compare the cost of the new supplier to the current one.
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Mathematics, 22.06.2019 04:40
Tiene pendiente -4 y pasa por el punto (-3,-2) encuentre la ecuación de la recta
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The file measles. dat contains data consistent with that obtained in a survey of parents whose child...
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