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D Question 6 5 pts What model would you use in a hypothesis test the difference between two means? O t O Chi square OF D l Question 7 5 pts Suppose a glass factor samples 2000 glasses. There are flaws in 75 of them. Find a 95% confidence interval for the true proportion of flaws. O (033,.041) O (0,.0375) O (0356.0393) O (029,.046)

Question 8 If the estimated mean from sample is 10, then O is equivalent to the population mean O it is the best estimate of the median O it does not have a variance because it is a number O it is subject to sample variation if another random sample is drawn

D Question 9 Consider the following results from a regression analysis: wage 410.35experience coefficient se of coefficient t-value p-vaule constant 410 142.3 .004 experience.35 .19 065 We can conclude from this data that O the t-stat for experience is 1.84 and it is not significant at the 5% significance level the t-stat for experience is 1.84 and it is significant at the 5% significance level the t-stat for constant term is 34.9 and it is significant at the 5% significance level the t stat for the constant is 2.88, and it is not significant at the 5% level C

Question 10o A correlation coefficient of -47 between household income and the purchase of chicken livers implies O an increase in household income causes a decrease in the purchases of chicken livers O an increase in the purchase of chicken livers will cause a decrease in household income O in a regression of chicken livers on household income will have an R-square-.685 O in a regression of chicken livers on household income will have an R-Square 22

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Answer #1

Q.6.

Both t test and z test are used to determine if two population means are equal or unequal. If we have known variance, we use a two-sample z test. If variance is unknown, we use a two-sample t test.

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