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Compare two models. Model #1 has an r-squared of .55 and an adjusted r-squared of .50. Model #2 has an r-squared of .52 and an adjusted r-squared of .51. Given this information, what model should you use?
a) Use model 1 because r-squared is higher
b) Use model 2 because adjusted r-squared is higher
c) Use model 1 because the combination of r-squared and adjusted r-squared is higher
d) Use model 2 because the combination of r-squared and adjusted r-squared is lower
e) Use model 1 because the adjusted r-squared is lower
If the t ratio for the slope of a simple linear regression equation is equal to 1.614 and the critical value of the t distribution at the 1% and 5% levels of significance, respectively, are 3.499 and 2.365 is the slope:
Show the sampling distribution of p if a random sample of 150 insured individuals is used to estimate the proportion having received at least one ticket.
Customers enter the waiting line at a cafeteria on a first-come, first-served basis. The arrival rate follows a Poisson distribution, while service times follow an exponential distribution.
Assume that you go to the drive through window at Wendy's and place an order. Two friends of yours independently place orders at the drive through window at the same Wendy's.
Calculate chi-square for the cross-tab. Show your work. Is there a statistically significant relationship between these variables?
Within distribution of scores, measures of dispersion give an indication of?
Four different types of fertilizers are used on raspberry plants. The number of raspberries on each randomly selected plaint is given below.
By using the normal distribution to approximate the desired probability.
For which of the following situations is it appropriate to use a scatter diagram or scatter plot?
What is the expected value and variance for the number of contacts in eight attempts?
When we carry out a goodness of fit chi-square test, the expected frequencies are based on the alternative hypothesis
Enzymatic method: 13.1, 12.7, 12.6, 13.3, 13.3. GC method: 13.5, 13.3, 13.0, 12.9. Does the enzymatic method give the same value as the GC method at the 95% confidence level?
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