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Rolling a pair of fair die 10 times and recording the number of times we get a 7. What is the probability of rolling exactly 3 sevens?
What is the probability that the shipment will be rejected? If the retailer inspects 6 of the CD shipment what is the probability that the shipment will be accepted?
What is the sensitivity and specificity of the test? Suppose that 1 out of 500 infants are born with Down's syndrome.
A sample of 40 ovservations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observers is selected from a second population.
What are the optimal values of A and B? What is the minimum cost and if the cost of B could be reduced to $42 per unit, how many units of B would be optimal? What would the minimum cost be?
Calculate the z - scores for the three samples, compare the z score to the t-statistic, is the null hypothesis accepted or rejected?
A sports researcher gave a standard written test of eating habits to 12 randomly selected professionals, four each from baseball, football, and basketball. The results were as follows:
An attempt was made to evaluate the inflation rate as a predictor of the spot rate in the German treasury bill market. For a sample of 29 quarterly observations the estimated linear regression
Give a 99% confidence interval for the mean number of years general managers of major-chain hotels have spent with their current company.
A pair of dice is rolled. The sum of the faces on top is observed. What are the expectation, variance, and standard deviation of the observed sum? The Expectation and Variance Template attached to the main posting is optional and recommended.
Average salary of $27,839 with a standard deviation of $7,400. At the 0.01 significance level, do teachers with Master Degrees have higher salaries?
Standard deviation was $15.50. For 56 Model B ovens, the mean repair cost was $85 and the standard deviation was $30. At alpha=.01, would you buy Model A?
the director of an advertising agency is concerned with the effectiveness of a television commercial.what null
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