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The results of this study report that 139 heart attacks developed among the aspirin users and 239 heart attacks developed in the placebo group. This was said to be a significant result in favor of aspirin as a possible preventive for heart attacks. To demonstrate this difference, place the data on heart attacks on an appropriate two-way table.
(Remember, the 22,000 participants were about evenly split between aspirin and placebo.)
What are the appropriate conditional proportions to study if we want to compare the rates of heart attacks for the two treatment groups? Do these proportions turn out to be quite different.
In the sample of 400 households, 112 were watching the series. At the 5% significance level, would the series be judged successful on basis of this sample information?
Robinson & Associates performs employment screening for large companies in southern California. It usually follows two-step process. First potential applicants are given a test that covers basic knowledge and intelligence. If applicants score b..
Using the Student's t distribution statistical table, determine 1.645 value. Describe why t distribution approaches z distribution as sample size gets larger.
(a) Show that the game is progressively bounded. (b) Find the sets N and P. (c) Describe the winning strategy.
If the sample mean is 12.7 oz. and the sample standard deviation is 0.70 oz., find the 95% confidence interval of the true mean.
according to the national education association the mean salary of public school teachers was 35819 in 1994. assume
consider the hypothesis test given byh0 mu 530h1 mu ne 530in a random sample of 85 subjects the sample mean is found
The key steps to tests of significance are to state H0 and HA, calculate the test statistic, compute the p- value, and make a conclusion based on the given significance level.
suppose that for he company produces independence day the company produces special bags containing 100 pieces of candy
Use a two proportion z-test to perform the required hypothesis test. State the conclusion.
The proportion of participants registering strong disapproval was 65%. At the 95% confidence interval and using a two-sided test, which of the following statements do these data support?
a study of on-time performance for an airline shows that 20 of their flights take off late. seventy percent of flights
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