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1. In each of the following situations, explain what is wrong and why.
(a) One of the assumptions for multiple regression is that the distribution of each explanatory variable is Normal.
(b) The smaller the P-value for the ANOVA F test, the greater the explanatory power of the model.
All explanatory variables that are signi?cantly correlated with the response variable will have a statistically signi?cant regression coef?cient in the multiple regression model. 2. Constructing the ANOVA table. Seven explanatory variables are used to predict a response variable using a multiple regression. There are 140 observations.
(a) Write the statistical model that is the foundation for this analysis. Also include a description of all assumptions.
(b) Outline the analysis of variance table giving the sources of variation and numerical values for the degrees of freedom.
in 1999 a sample of 200 in-store shoppers showed that 42 paid by debit card. in 2004 a sample of the same size showed
The KW water is provided to approximately 750,000 people, who are served through more than 362,000 accounts. All accounts are metered and billed monthly.
Carbon monoxide (CO) emissions for a certain kind of car vary mean 2.4 g/mi and standard deviation 0.7g/mi. A company has 60 of these cars in its fleet. Let y represent the mean CO level for the companies fleet. Estimate the probability that y is ..
You are choosing between the following investment strategies: Invest $200 in stock A. Stock A costs $20 per share. Expected yield per share of stock A is $2, and the variance of yield per share is 9 ($-squared). Which investment strategy has the hi..
(a) Give a 95% confidence interval for the mean ARSMA score of Mexicans. (b) What assumptions does your condence interval require?
Arrivals to a bank automated teller machine (ATM) are distributed according to a Poisson distribution with a mean equal to three per 15 minutes.
Determine a 99% confidence interval for mean pH in rainfall. How would you distinguish interval?
The number of customers using the service desk has a Poisson distribution. What is the probability that during a randomly selected half-hour period no more than 2 customers use the service desk?
Perform a two-sample z-test for proportions to test if men are more likely than women to make online purchases of books.
Estimate the number of workers in the sample who are union members by giving the mean of the relevant distribution (that is, the expectation of the relevant random variable). Do not round your response.
a new brand of chocolate bar is being market tested. four hundred of the new chocolate bars were given to consumers to
Determine the standard error of students that favoured the move.
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