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Fifty-three percent of all persons in the u.s. population have at least some college education. choose 10 persons at random. Find the probability that at least 5 do not have any college education.
Draw the graph of the regression line on the same plot as the scatter diagram above.
Quality Progress, February 2005, reports on improvements in customer satisfaction and loyalty made by Bank of America. A key measure of customer satisfaction is the response (on a scale from 1 to 10) to the question
The President of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies.
What is the major difference between finding significance and confidence intervals using population samples or using population proportions?
Carry out an overall test to determine if there is significant evidence of a difference among A; B and C, at the significance level 1%.
While in Paymor Hospital such exams were given in 110 out of 200 cases. In a left-tailed test for equality of proportions, the p-value is?
A textile manufacturer estimates that it produces bolts of cloth with flaws following a Poisson distribution that has an average of one flaw per 200 feet of cloth.
Formulate and test an appropriate set of hypotheses to determine if the machine can be qualified. Use a = 0.05. Find the P-value.
Using the .05 level of significance, what should we conclude about the theory that 24 hours is the natural cycle? (That is, does the average cycle length under these conditions differ significantly from 24 hours?)
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
At the start of the study the mean of the group was 24 and the end of the study the mean of the group was 30. The standard deviation of the difference scores was 12.0 and we had 16 subjects.
A gambler has developed two strategies for betting in the game of blackjack. To test these strategies, he decides to go gambling on a casino boat.
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