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The air temperature was 33oF in the night and 66oF in the day. So in the day it was twice as warm as in the night. What's wrong with this statement?
A. Determine the sample size required to estimate a population proportion to within 0.032 with 97.8% confidence, assuming that you have no knowledge of the approximate value of the sample proportion
Suppose the distribution of Y, conditional on X = x, is N(x, x2), and marginal of X is U[0,1]. (a) Find Cov(X, Y)
The primary property of the alloys used for teeth filling is the percent of shrinkage on drying. For a certain alloy 45 test specimens showed an average shrinkage percentage of 18.4 and a variance of
Find the number of units that produces a maximum revenue. The revenue R is measured in dollars and x is the number of units produced.
Suppose you have data from an experiment with 3 levels of the independent variable. Explain why an ANOVA followed by post-hoc tests is superior to three t-tests for independent groups. (Hint: what t
Find an equation of the parabola that has the indicated vertex and whose graph passes through the given point. Vertex: (-3, -5); point: (-2, 0)
In a recent study of the effectiveness of popular diet plans, subjects were given a numerical score of how well they adhered to the diet, as well as having their weight loss measured.
Find an equation of the parabola that has the indicated vertex and whose graph passes through the given point. Vertex: (-5, 5); point: (-8, 4)
Give an example of one pair of these variables for which it does not make sense to calculate a correlation coefficient. Explain. Give an example of one pair of these variables for which it does makes
List some of the risks in using samples to make inferences about populations from which the samples were drawn. What can be done to mitigate these risks?
Give two suggestions regarding how a statistician might generate probability estimates when empirical data is unavailable.
Give the 90% large-sample confidence interval for the proportion p of all teens with profiles who include photos of themselves. Large-sample Interval:?
Suppose for each student in a large statistics class, you record how far she/he sits from the teacher during a particular class session and how much time she/he spends on her/his computer during cla
Find an 85% confidence interval for the mean weights of the two Southwest Regions. What does this mean when comparing the mean weight of grey wolves from the two regions
Estimate a multiple regression model for housing starts using the mortgage rate and the unemployment rate as the explanatory variables. At the 5% significance level, evaluate the individual signific
NOAA recently conducted a study to compare the height of ocean waves one mile from shore to the velocity of the wind at that point.
The average/mean hours spent asleep for a group of people is 5.6 hours. The standard deviation is 1.0 hour. What is the shortest time spent sleeping that would still place a person in the top 5% of sl
If it is reported that 1 in 6 eggs is contaminated with Salmonella. If Salmonella contamination occurs independently in egg cartons and we should make a 3 egg omelet what is the probabilty that one
What is the probability that at least 2 of the presidents of the United States have died on the same day of the year? If you bet this has happened, would you win your bet?
Use these summary statistics to determine the equation of the least squares line for predicting the baby's weight from the mother's age.
In a simple linear regression model, if the plots on a scatter diagram lie on a straight line, what is the coefficient of determination?
The value of the test statistic for the regression coefficient of Leverage is calculated as t198 = -1.09 with an associated p-value of 0.2770. The correct decision is to: