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A study found that for 60% of the couples who have been married 10 years or less, both spouses work. A sample of 30 couples who have been married 10 years or less are selected from marital records available at a local courthouse. We are interested in the number of couples in this sample in which both spouses work. What is the probability that this number is:
(a) 20 or more?(b) 25 or more?(c) 10 or fewer?
(Use the normal approximation.)
At the .01 significance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
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Has the average community level of suspended particles for the month of August exceeded 30u/m3?
Assuming that the two job offers are independent of each other, what is the probability that the applicant gets an offer from both companies?
Do the data indicate that the lengths of one supplier's 2x4's are subject to more variability than those of the other supplier? Assume α = 0.05. (HINT: F Test for Differences in Two Variances)
question given the situation described identify the type of sampling involved. all the blackjack dealers on break at
The standard deviation of the sample was 6.2 weeks. Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks?
comparison of paired and unpaired samples test.in january 08 fifty clients of a county mental health mental retardation
The overall model statistically adequate at a 0.05 level of significance for predicting sale price(y)? For a moving average which is not true?
In a recent study, a random sample of children in grades two through four showed a significant negative relationship between the amount of homework assigned and student attitudes. What is the explanatory variable and what is the response variable?
Calculate the standard error of estimate for the regression equation.
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