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Question: Refer to Example II. A 95% confidence interval for the difference in proportions of children who would get ear infections with placebo compared to with xylitol was 0.02 to 0.226. On the basis of this information, specify a one-sided 97.5% confidence interval and explain how you would use it to test H0: p1 - p2 = 0 versus Ha: p1 - p2. 0 with a = .025.
Example II: Ear Infections and Xylitol For Example I, children were randomly assigned to take xylitol or a placebo in a clinical trial done to see if xylitol might reduce the risk of getting ear infections. The Minitab output on page 480 of Chapter 12 provides 0.036 as a lower bound for a one-sided 95% confidence interval for the difference between population proportions getting ear infections for placebo versus xylitol.
Example I: The Prevention of Ear Infections On the basis of its biochemical properties, Finnish researchers hypothesized that regular use of the sweetener xylitol might be useful for preventing ear infections in preschool children and carried out a study to test this hypothesis (Uhari, 1998).
the heights of 18-year-old men are approximately normally distributed with mean 68 inches and standard deviation 3
"Normal Distribution" (Note: Please respond to one [1] of the following two [2] bulleted items)
18 contained both a blue pen and a pencil, and 10 contained all three items. How many backpacks contained exactly two of the three writing instruments?
Determine whether the scatter diagram indicates that a linear relation may exist between the two variables. If the relation is linear, determine whether it indicates a positive or negative association between the variables.
Test the manager's claim at 5% and 1% significance level tests.
Table shows the number of passengers responding to the survey and the number that consider the service as either outstanding or good. Construct an appropriate control chart and comment on the service level of the airline.
How do we go about interpreting the results of various types of statistical tests in health care research?
question in a city in italy 30 of the families have a mastercard 20 have an american express card and 25 have a visa
Emily and Emma were twin sisters who were each left a will inheritance of $2,000. Emily invested her money for 3 years, at a simple interest rate of 7.8%. What was the accumulated principal of their pooled money at the end of the 5-year period
Calulate the critical value of ra. (f) Can you reject p = 0? 12.4 Moviegoer Spending ($) on Snacks Age (X) 30,50,34,12,37,33,36,26,18,46. Spent (Y) 2.85,6.50,1.50,6.35,6.20,6.75,3.60,6.10,8.35,4.35.'
a sample of 235 students found that 18 had a gpa greater than 2.89. the population from which the sample was drawn is
What sample size would be needed for an error of ± 1.5 with 98 percent confidence? (Data are from a project by MBA student Wendy Blomquist.)
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