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Suppose that you add 10 to all of the observations in a sample. How does this change the sample mean? How does it change the sample standard deviation?
The fill volume of cans produced by a certain machine is normally distributed with mean 12 oz and standard deviation .03 oz. [4] a. What proportion of cans contain less than 12 oz?
The results are shown below. Research question: Are the mean waiting times the same for emergency patients in these four hospitals? Use 0.05 for the significance level in making your decision.
A chi-square test for goodness of fit is used to test whether or not there are any preferences among 3 brands of cola.
New car manufacturer claims that miles per gallon for gas consumption is mound shaped and symmetric with a mean of 25.9 mpg with a standard deviation of 9.5 mpg.
Defects will go into product assembly and will have to be replaced later at a cost of $10 each when they are detected in finnal product testing.
according to the statistical abstract of the united states there are 31.1 millions one-person households 38.6 millions
Determine the regression equation, letting the first variable be the independent (x) variable. Find the indicated predicted values.
Calculate the chi-square statistic χ2 to determine if there is enough evidence to conclude that the number of minutes spent online per day is related to gender.
For the following ANOVA experiments, determine the critical region(s) and critical value(s) that are used in the classical approach for testing the null hypothesis
Three dessert packages to choose from. In how many different ways could the couple select an appetizer package, a main course,and a dessert package?
The mean of a standard normal probability distribution.
Calculate the Average yield per acre, calculate the Standard deviation and explain the difference between a one sample and a two sample hypothesis test; provide an example of each.
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