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Interpret the slope of the fitted regression Home Price = 125,000 + 150 Square Feet. (b) What is the prediction for Home Price if Square Feet = 2,000? (c) Would the intercept be meaningful if this regression applies to home sales in a certain subdivision?
Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
If person is selected at random determine the probability that he/she has enzyme level less than 4.0 units/ml?
Suppose you were to cut up the directory and pull out one listing at random to contact.
construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under. Assume fast food weekly expenditures are normally distributed.
How can you tell when you should use the ANOVA versus a t-test? What is one problem with using the ANOVA when the t-test is the appropriate data analysis?
what is the required sample size is the error is to be less than 1/2 hour with a 95% level of confidence?
A particular medical operation proves fatal in 1% of the cases. Find an approximation to the probability that there will be at least 2 fatalities in 200 operations.
Although there is a popular belief that herbal remedies such as ginkgo biloba and ginseng may improve learning and memory in healthy adults, these effects are usually not supported by well-controlled research.
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.
Suppose that 0.6 of the present 25,000 vehicle occupants killed in collisions were not wearing seat belts. There are about 170 million registered cars and trucks on the highway today.
Construct a decision table for this problem. Include all conditional values and probabilities in the table.
The sample mean and the standard deviation were determined to be 120 and 40 respectively. The standard error of the mean is?
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