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Question - Predicting the total amount of PCB. Use the four congeners, PCB52, PCB118, PCB138, and PCB180, in a multiple regression to predict PCB.
(a) Write the statistical model for this analysis. Include all assumptions.
(b) Run the regression and summarize the results.
(c) Examine the residuals. Do they appear to be approximately Normal? When you plot them versus each of the explanatory variables, are any patterns evident?
A marketing firm recently studied the number of times men and women who live alone that buy takeout dinners in a month. Two independent samples were taken one with 50 men and 55 women.
Name recognition. A political candidate runs a weeklong series of TV ads designed to attract public attention to his campaign.
This project will only use the Closing Values. Assume that the closing prices of the stock form a normally distributed data set. This means that you need to use Excel to find the mean and standard deviation and then use those numbers and the metho..
Using the empirical rule, what is the approximate percentage of the men between the following values? A. 176 cm and 186 cm B. 166 cm and 196 cm.
Here are the annual numbers of deaths from tornadoes in the United States from 1990 through 2000.- Find these statistics by hand (no calculator!):- mean- median and quartiles.
Suppose you want to conduct a survey of the attitude of psychology graduate students studying clinical psychology toward psychoanalytic methods of psychotherapy.
At the .01 significance level, is there a difference in the mean number of times men and Women order take-out dinners in a month? What is the p -value?
At a small computer peripherals company, only 60% of the hard drives produced passed all their performance tests the first time.
Snoring. After surveying 995 adults, 81.5% of whom were over 30, the National Sleep Foundation reported that 36.8% of all the adults snored.
Make a tree diagram of Elaine's progress. Notice that she has different probabilities of passing on each successive try.
difference between the population proportions. You may assume the samples are independent. Which of the following gives the justification for normality in this situation?
you and your opponent both roll a fair die. if you both roll the same number the game is repeated otherwise whoever
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