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To test the difference between two means using two mean z test.
The MBA department is concerned that dual degree students may be receiving lower grades than the regular MBA students. Two independent random samples have been selected. 100 observations from population 1 (dual degree students) and 100 from population 2 (MBA students). The sample means obtained are X1(bar) = 85 and X2(bar) = 88. It is known from previous studies that the population variances are 4.0 and 5.0 respectively. Using a level of significance of .10, is there evidence that the dual degree students are receiving lower grades? Fully explain your answer.
Is there evidence that population mean amount is different form 8.17 ounces? (Use a 0.05 level of significance.) with sample standard deviation of 0.051 ounce.
Choosing the appropriate the sampling design for the given data
A company makes molded plastic toys. They study the plastic injection process into the molds. A common cause of variation and What are the control limits for an chart
An SRS of 100 of a certain popular model car in 1993 found that 20 had a certain minor defect in the brakes. An SRS of 400 of this model car in 1994 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of t..
The sample mean of the number of spots on the 6000 rolls, should be about If this die is rolled 6000 times, the number of times we get a 2 or a 3 should be about
Develop a linear regression equation for the given data and forecast how much money Robert will win if he spends $30.
what percent of the total number of seeds germinated?
We want to estimate the population mean within 5, with a 99% confidence level. The population std dev is estimated to be 15. How large is the required sample size?
By using the maximax criterion, what decision should be made by the decision maker?
What happens to the probability of getting exactly 50% heads?
Write the regression equation approximately. Computed the coefficient of determination(r 2 ).
In a distribution of scores, the arithmetic mean is 51, the median is 55, and the mode is 62. What is the score, in percentile form, of a subject who does less well than two-thirds of the sample?
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