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An online book store wants to determine if there is an association between coupon redemption and gender. After a special coupon broadcast to its reward members, the following data on coupon redemption at check out were collected.
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
If statistically significant, do you believe the difference is large enough to be significant? If so, to whom, and explain why? Is normality assumption fulfilled? Describe.
Determine following probabilities where Z follows standard Normal distribution?
Compute the mean number and median number of apples in a bag.
A state survey investigates either the proportion of 8percent for employees who commute by car to work is higher than it was five years ago.
Find out coefficient of correlation between variables. Interpret the value.
Compute the effect size with gender as the grouping variable and ADDSC as the dependent variable.
From a previous study, the standard deviation of the ages is known to be 3 years.
Among the half that had surgery, 80% showed improvement after three months, but only 54% of those who used the wrist splints improved. what's the standard error of the difference in the two proportions?
Test the hypothesis that the annual incomes of corporate trainers in areas of more than 500,000 are significantly more than those in areas of less than 100,000.
Construct a 95 percent confidence interval for the true mean.
Construct a payoff table for Mountain Ski's decision problem of how many pairs of skis to order. What is the best decision from an expected value basis?
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