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An educational researcher is interested in comparing the reading skills of children in three schoos systems. Inner City, Suburban, and Rural. A random sample of 4 children from each system provided the following reading scores:
Inner City--79-84-74-93Suburban--90-84-87-95Rural--79-73-67-78
Assume the samples comes from normal populations with equal variances.
At the 5% significance level, can the researcher reject the hypothesis that the mean reading scores of all children in the three school systems is the same ? Formulate and test the appropriate hypotheses. Use the critical value approach.
The cost accountant for Blue Pharmaceuticals has informed you that the company's materials quantity variance for the drug Allegro was exactly equal to its materials price variance for the year.
Carry out the suitable calculations to test for effect modification. Interpret your results.
Let X1, ..., Xn be a random sample from a two-parameter exponential distribution, Xi ~ EXP (theta, eta). (a) Assuming it is known that eta = 150, find a pivotal quantity for the parameter theta based on the sufficient statistic.
What method is best suited for such a survey? Draw the sample using the random number table and bring out the rationale of the procedure.
To revise an existing inventory system, a company needs to know something about the lead time for orders it places for a critical part. The company looks at the last 20 orders placed and finds that the lead time in days are:
A study sponsored by American Express Co. and the French government tourist office found that old American stereotypes about French unfriendliness weren't true.
Findout either the given correlation is significant at given level of significance. Illustrate what does sample size have to do with the significance of r.
An experiment consists of making 80 telephone calls in order to sell a particular insurance policy.
Using the following number of flirtations actions in the 4 hour period, test the "null hypothesis'
Different approaches for creating systems simulation models include?
Enter relative proportions of the 3 samples in order (20,50,30) in "Expected values" area.
Confidence interval for the true mean and Evaluate the 95% confidence interval for the true mean advertising expense?
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