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In a 2009 study of effectiveness of tPa in treatment of patients who have been hospitalized after myocardial infarction, 9 of 199 males receiving tPa and 13 of 97 males in control group died within 12 months.
• Use normal-theory method to test for significant differences in 12-month mortality between two groups.• Create observed and expected contingency tables for these data.• Conduct test above using contingency table method.
Then differerntiate your results using two different methods.
Determine the p-value; and at 93.7% confidence, test the above hypotheses.
Develop a 90 percent confidence interval for the proportion of applicants that fail the test. (Round your answers to 2 decimal places.)
Solve the problem: According to police sources a car with a certain protection system will be recovered 94% of the time. Find the probability that 4 of 8 stolen cars will be recovered.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
In the Florida lottery, six numbers from 1 to 53 must be selected. to win the jackpot, the six numbers must match the draw numbers.
Tired of careless spelling and grammar, a company decides to administer a test to all job applicants. The test consists of 20 sentences. Applicants must state whether each sentence contains any grammar or spelling errors.
Determine how large a sample should be taken to be 90% confident that the sample mean is within 0.12 ounces of the true mean weight of our bakery's loaves.
If the pilot plant fails, Rob feels the chance of the full-scale facility succeeding is only 20%. The probability that the pilot plant will succeed is estimated at 0.6. Structure this problem with a decision tree and advise Rob what to do.
The average cost of a one bedroom apartment in a town is $550 per month. What is the probability of randomly selecting a sample of 50 one bedroom apartments in this town and getting a sample mean of less then $530 if the population standard deviat..
A random sample of 51 observations was selected from a normally distributed population. The sample mean was = 88.6, and the sample variance was s2 = 38.2.
What percentage of observations of a normal distribution are represented by the mean plus or minus 1.96 standard deviations?
The statistical research was done primarily through the internet from governmental regulated sources. Estimates were used in consideration of absence of actual information.
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