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Financial advising
Starting from the model summarized in Table 4, what happens if you add the explanatory variable State to the model? (Limit your estimation to the n = 2,000 cases in the training sample.)
(a) Does the R2 increase by a statistically significant amount? Briefly interpret your result.
(b) Is any individual t-statistic for a dummy variable representing a state statistically significant at the 0.05 level? How does your answer depend on the choice of the baseline state?
(c) How might you refine the model that includes State?
components used in a cellular telephone are manufactured with nominal dimension of 0.3 mm and lower and upper
Investigate the percent of babies born below your birth weight by specific term. (If you do not know this information, make a guess of your birth weight and term.)
Given the follow set of pairs of data: x. 6 3 10 11 15 and y. 50 80 45 70 60. Compute the actual correlation coefficient.
Eighteen first interviews are usually scheduled per day. What is the probability that the average length of time for the eighteen interviews will be 40 minutes or longer?
a) Calculate the point prediction for the value x = 2,500. Give your answer as a whole number.
A recent study of the laundry habits of Americans included the time in minutes of the wash cycle. A sample of 40 observations follows. Determine the mean and the median of a typical wash cycle.
A confidence interval estimate for the population mean is given to be (35.55, 44.12). If the standard deviation is 15.797 and the sample size is 37, answer each of the following: (A) Determine the maximum error of the estimate, E.
The quality control inspector of a production plant will reject a batch of syringes if 2 or more defective syringes is found in a random sample of 8 syringes taken from the batch. Suppose the batch 1% defective syringes.
Neither subjects nor researcher knew who was assigned to what. Determine three terms explain the experimental design?
The population mean is greater than 200 and the sample mean is 215, we can say that the claim is true even without a formal test. I this true or false and why?
The Queen Mary sails between England and the U.S. Stowaways are sometimes found on board. The ages (years) of stowaways from eastbound and westbound crossings are given below. Eastbound: 24, 24, 34, 15, 19, 22, 18, 20, 20, 17 Westbound: 41, 24, 32..
Which would be inappropriate, and why. Then identify what you think is the best measure of variability to use for your example and explain why you believe it to be better than the others.
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