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Question: A two-factor experiment yielded the following data:
a. Determine if there is interaction between factor A and factor B. Use the p-value approach and a significance level of 0.05.
b. Given your findings in part a, determine any significant differences among the response means of the levels of factor A for level 1 of factor B.
c. Repeat part b at levels 2 and 3 of factor B, respectively.
a six-sigma black belt quality engineer found that in a random sampl of 140 printed circuit boards 18 are defective due
Among 9 females, the mean diameter of the heart was found to be 11 cm with a standard deviation of 1.01. Construct a 95% confidence interval for the mean difference in heart size.
Suppose the sample mean is x‾ = 12.89 and the sample standard deviation is s = 0.96. Should the manufacturing process be stopped?
Compute the 95% confidence interval on the proportion of times this person can predict coin flips correctly. What conclusion can you draw about this test of his ability to predict the future?
Estimate the difference between the proportion of Gen Y and the proportion of Gen X that made a donation via text message using a 99% confidence interval. Provide an interpretation of both the interval and the associated confidence level.
your manager who just read an abridged version of a statistics book wants you to test hypotheses for the difference in
a professor at a community college claims that a college algebra student can increase his or her score on an exam if
question a group of statistics students decided to conduct a survey at their university to find the average mean amount
assume that a sample is used to estimate a population proportion p. find the margin of error e that corresponds to the
The correct set of hypotheses to test the effect of the bonus plan, the difference between the t and z distributions
1. a researcher for reasons passing understanding wishes to assess the association between gender and total cholesterol
The following table shows the payroll for 10 major league baseball teams (in millions) for the 2002 season, along with the number of wins for that year.
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