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1. When one of the five predictor variables in the preceding example is elimi- nated from the analysis, the value of R2 drops from 0.75 to 0.71. What does this tell us about the variable that was dropped?
2. What is multicollinearity? Why does it occur in multiple regression problems? 3. What is stepwise regression? Why is it used? 4. Discuss the regression toward the mean phenomenon. Give a simple real- life example.
Using the 0.05 significance level what should we conclude about the theory that 24hrs. is a natural cycle? a) use hypothesis steps b) sketch distribution c) explain to someone who never took this course.
q1. find the probabilities for the following discrete random variablesa. among a shipment of 5000 tires 1000 are
Explain what you have done and what the results mean to a person who has never had a course in statistics - Give the Z scores for New Zealand college students who score 100 and 160.
444 voters to predict whether the budget will pass. Suppose the budget has 53% of the voters. What is the probability that the newspaper's sample will lead it to predict defeat?
Consider the partially completed ANOVA for a completely randomized one-way design presented below. The missing elements of the table are labelled A, B, C, D and E. How many treatments are being compared in this experiment
a manufacturer produces lightbulbs at a poisson rate of 239 per hour.the probability that a lightbulb is defective is
use the frequency distribution table below that shows the results from a survey which asked 200 households how many
That's a much larger sample than standard sample surveys. In spite, we cannot trust result to give good information about any clearly defined population. Explain why?
Calculate a value of lambda using the data from last week concerning the news networks and the reporting practices. Compare your resulting lambda to the resulting chi-square from last week.
a survey finds that 55 people out of 170 favor increasing property taxes to help pay for a new library. if this data is
thirty percent of all telephones of a certain type are submitted for service while under warranty. of these 70 can be
imagine the following game of chance. there are four dollar bills on the table. your roll a fair die repeatedly. every
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