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When you calculate CIs for time on task, I notice that you use the critical value from the t-distribution (TINV(0.05, degrees_of_freedom)). But when you calculate CIs for task completion rate (using the Adjusted Wald Method), you use the critical value from the z-distribution (1.96). Why don't you use the same value in both?
Independent random samples of 12 users of the other system rate their system on the same scale. Based on these data, are the two telecommunication system equally liked? Explain.
At the time she was hired as a server at the Grumney Family Restaurant, Beth Brigden was told, "You can average $72 a day in tips." Assume the population of daily tips is normally distributed with a standard deviation of $2.45.
What are the primary differences between investments in corporate stock versus corporate bonds? Since bonds pay interest, does that imply the individuals risk exposure is less for investing in bonds rather than stock?
This exercise is a "what if analysis" designed to determine what happens to the test statistics and interval estimates when elements of the statistical inference change.
Use the equation to predict the value of a home measuring 1500 sq. ft. which is at a distance of 0.75 mile from the centre of the town.
As part of an opinion survey, a simple random sample of 1,500 families is chosen. What is the chance that between 9% and 11% of the sample families will not own cars?
A firm engaged in manufacturing undergarments for gents employs 100 male and 144 female workers. The average production per day of a male worker is 60 items with a variance of 15 items, and that of a female workers is 65 items with a variance of 1..
Using the confidence interval method, test the claim that the average age of consumers is at least 30 years ( α= 0.05). Test the same claim by using the test statistics method ( Z or T test).
A confidence interval increases in width as:
Of the 250 students in a blind taste test, 150 (60%) preferred Milwaukee's Best over Natural Light. Then the 90% confidence interval for the student population proportion preferring Milwaukee's Best is:
What are the steps of the order of operations? Why is it important that you follow the steps rather than solve the problem from left to right?
In a random sample of 80 items, the defect rate is 5% but the manager claims that this is only a sample fluctuation and production is not really out of control. At the 0.01 level of significance, does the data provide sufficient evidence that the ..
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