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The positive effect of water fluoridation on dental health is well documented. One study that validates this is described in the article "Impact of Water Fluoridation on Children's Dental Health: A Controlled Study of Two Pennsylvania Communities" (American Statistical Association Proceedings of the Social Statistics Section [1981]: 262-265). Two communities were compared. One had adopted fluoridation in 1966, whereas the other had no such program. Of 143 randomly selected children from the town without fluoridated water, 106 had decayed teeth, and 67 of 119 randomly selected children from the town with fluoridated water had decayed teeth. Let p1 denote the proportion of all children in the community with fluoridated water who have decayed teeth, and let p2 denote the analogous proportion for children in the community with unfluoridated water. Estimate p1 - p2 using a 90% confidence interval and interpret the interval.
1. Find the range and standard deviation of the set of data
If two televisions are randomly selected, compute the probability that both televisions work. What is the probability at least one does not work?
Mention the advantages ofgraphic presentation of statistical data. What are the general rules for graphing the data? Explain how tables, graphs and charts help in the effective presentation of data.
A manufacturer of car batteries claims that his batteries will last, on average, 3 years with a variance of 1 year. If 5 of these batteries have lifetimes of 1.9, 2.4, 3.0, 3.5, and 4.2 years
What is the probability that a waitress will refuse to serve alcoholic beverages to only 2 minors if she randomly checks the IDs of 5 students from among 9 students of which 4 arc not of legal age?
If the null hypothesis is true, state the statistical distribution of the test statistic. Use α=0.05 and perform all 5 steps of hypotheses testing for complete credit.
Top management earn between $50,000 and $100,000 per year. A histogram of all salaries would have which of the following shapes?
a) Define the decision variables? How many decision variables are there in total? b) What is the objective function? c) What are the constraints including the sign and type restrictions?
probability based on normal distribution.1.determine the area under the standard normal curve that lies to the left of
Show how to figure the significance level, the test statistic, and the critical values from this test.
A wholesaler assures retailer replacement times for TVs normally dist. with mean of 8.2 and s.d. of 1.1. The retailer finds that a random sample of 20 sets from the wholesaler have mean replacement time of 7.6 years.
1.At a local university, the Student Commission on Programming and Entertainment (SCOPE) is preparing to host its first rock concert of the school year.
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