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A sample of 500 respondents in a large metropolitan area was selected to study consumer behavior. Among the questions asked was "do you enjoy shopping for clothing?" Of 240 males, 136 answered yes. Of 260 females, 224 answered yes. Construct a contingency table to evaluate the probabilities. What is the probability that a respondent chosen at random:
a. enjoys shopping for clothing?
b. is a female and enjoys shopping for clothing?
c. is a female or enjoys shopping for clothing?
d. is a male or a female?
If life of wild pheasants follows a normal distribution with a mean of 9 months and a variance of 9, what percent of the population will be less than 11 months of age.
Obtain a test statistic and p-value assuming equal variances. Interpret these results.
If all samples of size 64 are drawn, mean of sample according to Central Limit Theorem is 100.
Infomercials often peddle products under the guise of "studies show," While some of the products are surprisingly good, many aren't.
A bank wants to get new customers for their credit card. They try two different approaches in their marketing campaign. The first promises a "cash back" reward; the second promises low interest rates. A sample of 500 people are mailed the first br..
Where S, A, and R are measured in dollars per week. Vanguard's marketing director is comfortable using parameter estimates that are statistically significant at the 10% level or better.
Test to see if the mean cell phone bill has changed since 2004. Use a .05 level of significance for the test.
Determine SSE, SS (Total) and the explained sum of squared variation SSR and find the estimated y intercept slope and write the regression equation.
Construct the 90% and 95% interval estimates for the population mean weekly sales.
Determine the expected frequencies for each of the cells in the following contingency tables. For each problem, state how many of the expected values actually had to be computed and how many could be found by subtraction.
By using the normal distribution to approximate the desired probability.
What does null hypothesis for repeated-measures hypothesis test state?
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