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If the net regression coefficients in the population are significantly different from zero, what can be included?
A. No relationship exists between the dependent variable and any of the independent variables.
B. Very strong correlations exist among the variables.
C. Good predictions are not possible.
D. At least one of the net regression coefficients is not equal to zero.
An election coming up next week promises to be very close. In fact, assume that 50% are in favor and 50% are against. Suppose you conduct a poll of 791 randomly selected likey votes. Approx. how different will the percent in favor (from the poll) ..
Show that if Z1 and Z2 are independent standard normal random variables, then for all ρ (correlation), Z 1 and ρZ 1 +sqrt(1-ρ 2 )*Z 2 are standard normal with correlation ρ.
Consider the following number of defective circuit boards produced by two different machines on seven randomly selected days. To three decimel places what is the mean of machine A?
The author collected data consisting of the month of birth of actors who won Oscars. Use a 0.05 significance level to test the claim that Oscar winning actors are born in different months with the same frequency.
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank-sum test, evaluate the significance of the results, assuming there are no ties.
Explain the purpose of the chi-square test for independence. Provide some practical examples where this test might be used in business.
If "fair" coin is tossed four times and comes up heads all four times, probability of heads on the fifth trial is?
Multiple choice questions based on regression - A regression and correlation analysis resulted in the following information
When the underlying average of a time series is very stable and there is no trend, cyclical, or seasonal influences,
A circus clown at the top of a 60-foot platform is playing catch with another clown on the ground. The clown on the platform drops a ball at the same time as the one on the ground tosses a ball upward at 80 ft/sec.
What is the probability of finding 1 or more children with chronic bronchitis in a population where the incidence rate of chronic bronchitis is 10% (like the one above?)
Given a simple random sample of men and a simple random sample of women, we want to use a 0.05 significance level to test the claim that the percentage of men who smoke is equal to the percentage of women who smoke.
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