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Suppose the Acme Drug Company develops a new drug, designed to prevent colds. The company states that the drug is equally effective for men and women. To test this claim, they choose a simple random sample of 100 men and 200 women from the population. At the end of the study, 46% of the men caught a cold; and 51% of the women caught a cold. Based on these findings, can we reject the company's claim that the drug is equally effective for men and women? Use a 0.05 level of significance.
a) give the null and alternative hypothesesb) the test statistic including the variable(z or t)c) the P valued)the decision to reject or fail to reject the null hypothesis and a statement about the claim.
In a random sample of 184 college students, 97 had part-time jobs. Find the margin of error for the 95% confidence interval used to estimate the population proportion.
A polling organization plans to sample 1000 adult Americans to estimate the proportion of Americans who think crime is a serious problem in this country. (a) What is the parameter of interest to the polling organization? (b) What will be the stati..
A bus company claims that the mean waiting time for a bus during rush hour in less than 7 minutes. A random sample of 20 waiting times has a mean of 5.2 minutes with a standard deviation of 2.1 minutes.
In a sample of 64 patients, suppose that 47 showed allergic reduced reaction and 17 show increased reaction. Are these results sufficient to conclude a significant effect?
fourth group was divided into small discussion groups. A high of 10 was possible. A sample of five tests was selected from each group. The test grade results were: At the 0.01 level, what is the critical value?
Formulate and present the rationale for a hypothesis test that Par could use to compare the driving distances of the current and new golf balls.
A problem to solve. What sample size must be taken to estimate the average gas price in houston with 99% confidence and max error of 5 cents?
If it is assumed that the probability distribution for the number of room rentals forms a normal distribution, what is the probability that on a given night?
What decision should be made regarding the null hypothesis?
Test the claim about population mean, u, at given level of significance using given sample statistics. Find out critical value(s).
Generate a relative frequency histogram using ten-point intervals to show the distribution of the scores.
Set up the null and alternative hypotheses to test whether the proportion of MBA students who expect to stay at their first job five years or more is less than one-fourth of all U.S. MBA students.
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