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In a randomized, double-blind, placebo-controlled trial of children, echinacea was tested as a treatment for upper respiratory infections in children. "Days of fever" was one criterion used to measure effects. Among 337 children treated with echinacea, the mean number of days with fever was 0.8, with a standard deviation of 1.50 days. Among 370 children given a placebo, the mean number of days with fever was 0.64 with a standard deviation of 1.16 days (based on data from "Efficacy and Safety of Echinacea in Treating Upper Respiratory Tract Infections in Children," by Taylor et al., Journal of the American Medical Association, Vol, 290, No. 21). Use a 0.05 significance level to test the claim that echinacea affects the number of days with fever. Based on these results, does echinacea appear to be effective?
Propose a two sample z-test of a population mean and identify it as either an independent test or a dependent test.
Determine the value of correlation coefficient between these 2 variables?
Compare his performance on the two tests in terms of percentile ranks. In which exam did he do better? Please show computations and discuss.
At the .05 significance level, can we conclude that the guideline is still reasonable?
What is coefficient of determination? Calculate F statistic. (Hint: You must complete the table to answer the question.)
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
A dataset has 1000 records and 50 variables with 5% of the values missing, spread randomly throughout the records and variables. An analysis decides to remove records that have missing values. About how many records would you expect would be remov..
If we know that the length of time it takes a college student to find a parking spot in library parking lot follows a normal distribution with mean of 3.5 minutes and a standard deviation of 1 minute, determine the probability that a randomly sele..
Sketch the distribution of sample means for sample of n = 25 scores from this population.
Analysis of variance- One way classification - Are there differences among these 3 drugs with respect to how long they are retained in the body?
Compute a 95% confidence interval for the population proportion of positive drug tests. Explain why is the normality assumption not a problem despite the very small value of p.
Restaurateur Danny Valentine is evaluating two, sites, Raymondville and Rosenber, for his next restaurant. Denny suspects that Raymondville residents (population 1) dine out more often (number of times per month) than Rosenberg residents (populati..
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