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A group of researchers conducted an experiment to determine which vaccine is more effective for preventing getting the flu. They tested two different types of vaccines: a shot and a nasal spray. To test the effectiveness, 1000 participants were randomly selected with 500 people getting the shot and 500 the nasal spray. Of the 500 people were treated with the shot, 80 developed the flu and 420 did not. Of the people who were treated with the nasal spray, 120 people developed the flu and 380 did not. The level of significance was set at .05. The proportion of people who were treated with the shot who developed the flu = .16, and the proportion of the people who were treated with the nasal spray was .24. The calculated p value = .0008.
What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?
Describe the sample distribution of p-hat, the sample proportion of college students with cell phones who send or receive text messages with their phones.
Find the probability of each value of X. Draw a histogram to display this distribution. (Because probabilities are long-run proportions, a histogram with the probabilities as the heights of the bars shows what the distribution of X would be in ver..
the breaking strength of flimsy safety belts is known to be approximately normally distributed with a population mean
an insurance policy costs 100 and will pay policyholders 10000 if they suffer a major injury or 3000 if they suffer a
Differentiate between correlation and causation. What are the practical applications? How would it be used in the workplace?
Beta random variable with mean 1/3 and variance 1/18. What is the probability that next month, the procurement office orders at least 7/12th of its purchase from this vendor?
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
The waiting times have a standard deviation of 4.9 minutes. Use a 0.025 significance level to test the claim that with a single line, waiting times vary less than with individual lines.
jane and janet are both taking math 301. they are good students and work independently. jane has a 45 chance of earing
Medical researchers interested in determining the relative effectiveness of two different drug treatments on people with a chronic mental illness established two independent test groups.
a seed company claims that its variety of seeds has a 90 germination rate. for a sample of 800 seeds 700 germinated.
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