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Is a flu shot really effective? In 2012-2013 the CDC reported that the flu vaccine was 56% effective. That is, 56% of all people receiving the flu vaccine who were exposed to a flu virus did not contract the flu. To check this claim (56% effective), a random sample of 50 at-risk people who received a flu shot was selected.
During the flu season, all 50 were exposed to the flu and 29 actually contracted the disease. Is there any evidence to suggest the claim is false, that the chance of contracting the flu is greater than 44%?
Estimate the proportion of customers that will be using food stamps at his store. How large a sample is required to estimate the true proportion to within 3% with 98% confidence?
a manager wishes to determine whether the mean times required to complete a certain task differ for the three levels of
For the last 18 review periods the average sales figure has dropped to $11,500 with a standard deviation of $4,000. Management is concerned. Perform a hypothesis test to determine if this change in sales is a potential problem.
a student earns 14 per hour for tutoring and 7 per hour as a teachers aid. let x the number of hours each week spent
Why might you expect there to be economies of scale in airline transportation? How are the development of hub-and-spoke networks related to economies of scale and scope?
Ten adult Americans are selected at random and the results are recorded. Find the probability that at least nine adults were satisfied.
for a given set of data the standard deviation measuresthe difference between the mean and the data point farthest from
Five hundred graduates were cross classified by socio-economic group and the presence or absence of a certain skill gap. The results were as shown below.
Suppose the probability that a federal income tax return conatins an arithemetic error is 0.2. If 10 federal income tax returns are selected at random,
Let X be a continuous random variable with probability density function
Minnesota Co. uses regression analysis to assess its economic exposure to fluctuations in the Canadian dollar. The dependent variable in the regressions is the monthly percentage change in the company's stock price, and the independent variable is..
Use the .05 significance level and the 5 step hypothesis testing process to check if there is a difference in the mean flight times among the three airlines.
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