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Testing for equality of variances.
Independent random samples were taken from normal distributions of the yearly production of ships built by the International Ship Building Company under (a) a fixed-position layout (sample size = 7) and (b) a project layout (sample size = 8). The company wants to know if the variances in the yearly production of ships for the 2 layouts are equal. The sample variances are: fixed-position layout = 9, project layout = 4. Use .10 for the level of significance.
What sample size would be required to obtain the error of ±10 square millimeters with 99 percent confidence?
Does this result support original claim, or is population percentage considerably less than 45%. Use alpha=.05 for level of significance.
Calculate separate confidence intervals for the numbers of days absent for Clinic A and Clinic B, respectively.
X is a continuous random variable uniformly distributed on [20, 45] that is, the end points c = 20 and d = 45.
Extra college-level training, and rest of the sailors arn't accounted for. How does your sample compare to what you expected to determine? Define null hypothesis.
IS there any evidence that a freshman's chances to graduate may depend upon what kind of high school the student attended? Describe.
Make a scatter plot of Y and X1 using Word. To do this click on insert and then chart. Click on X Y (Scatter). Enter the data from the table.
A professor of math refutes the claim that the average student spends 3 hours studying for the midterm exam. Which hypothesis is used to test the claim?
Draw a tree diagram representing this experiment. Use this tree diagram to find the probabilities below.
Find out the probability distribution of blood types by gender in the group of 1000 individuals.The table below gives the distribution of blood types by gender in a group of 1000 individuals.
At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card.
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