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One-fourth of the residents of the Burning Ridge Estates leave their garage doors open when they are away from home. The local chief of police estimates that 5 percent of the garages with open doors will have something stolen, but only 1 percent of those closed will have something stolen. If a garage is robbed, what is the probability the doors were left open?
What is the probability that in a sample of 10 pieces: 5 or more will be defective?
Utilize a test of the difference among proportions when answering these questions. Illustrate the research hypothesis.
At the .01 significance level, is there a relationship between job pressure and age?
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
Book inventory Record information - Ratio, interval, nominal or ordinal.
A stationery store wants to estimate the mean retail value of greeting cards that it has in its inventory. A random sample of 100 greeting cards indicates a mean value of $2.55 and a standard deviation of $0.44.
We want to test the hypothesis that population B has a smaller variance than population A.
(A) What sums are needed to calculate a correlation coefficient? (B) What are the two ways of testing a correlation coefficient for significance?
How many subjects would you approximately need to reduce the length of the 95% confidence interval to 2 units?
If there is relationship between parental income and SAT score, why can't we bring to a close that differences in score are caused by differences in parental income.
Consider the experiment of rolling a pair of dice. Suppose that we are interested in the sum of the face values showing on the dice.
The sample size n, the sample means, and the sample standard deviations for the two groups are given
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