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A researcher used stepwise regression to create regression models to predict Birth Rate (births per 1,000) using five predictors: Life Exp (life expectancy in years), Inf Mort (infant mortality rate), Density (population density per square kilometer), GDPCap (Gross Domestic Product per capita), and Literate (literacy percent). Interpret these results.
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?
If 36 sand dollars are selected at random for collection, determine the probability that average diameter of those sand dollars is more than 3.80 centimeters. Suppose that variable is normally distributed.
Using a separate 2 by 2 table, compute predictive value positive and predictive value negative for population of 1,000 drug users.
37 percent of managers have MBA degrees. Using probability formulas. Determine the proportion of employees who are managers and have MBA degrees.
Give an example of a situation in which you believe a Type I Error is more serious. Give an example of a situation in which you believe a Type II Error is more serious. In each case, why do you think so?
Below you are given a partial computer output based on a sample of 21 observations, relating an independent variable (x) and a dependent variable (y).
She believes that the number of customers served on weekdays follows a normal distribution. Construct an 99% confidence interval of the average number of customers served on weekdays.
Difference in the mean number of times men and women order take-out dinners in a month? What is the p-value?
Find out if the population monthly expenditure mean is less than $212. The level of significance selected is 1% and 26 accounts are sampled. What is the critical value?
Pizza House offers 4 different salads, 5 different kinds of pizza, and 4 different desserts. How many different three course meals can be ordered?
If the mean times for both George and Julia are actually the same, what is the probability that George will be let go?
If Kim expects to use phone for 21 hours per month, which plan must she choose?
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