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The bank credit card department of Carolina Bank knows from experience that 5 percent of the card holders have had some high school, 15 percent have completed high school, 25 percent have had some college, and 55 percent have completed college. Of the 500 card holders whose cards have been called in for failure to pay their charges this month, 50 had some high school, 100 had completed high school, 190 had some college, and 160 had completed college. Can we conclude that the distribution of card holders who do not pay their charges is different from all others? Use the .01 significance level.
Use the usual five-step hypothesis testing procedure.
Testing for a linear correlation. Construct a scatter plot, find the value of the linear correlation coefficient r, and find the critical values of r from the table below using a=0.05.
Is the z value positive or negative? Explain why it should be positive or negative.
What is the probability that a randomly chosen package is improperly sealed?
To test whether or not there is a difference between treatments A, B, and C, a sample of 12 observations has been randomly assigned to the 3 treatments.
How many participants need to be enrolled in each group to have a 90% chance of detecting a significant difference using a two sided test with α =0.05 if compliance is perfect?
A medical researcher estimates that no more than 55% of the U.S. adults eat breakfast every day. In a random sample of 250 U.S. adults, 56.4% say that they eat breakfast every day.
Can you please describe what I need to do to complete this? I do not understand how to plot the figures within the spreadsheet or calculate them.
Using the p- value approach, test the hypotheses at the 5% level of significance.
Suppose that a model for the joint distribution of these rvs is a bivariate normal distribution.
Statistical Hypothesis test for the given sample
What would you recommend Taylor do to cut back its labor cost? (Illustrate using an ABC plan.)
Which of the following does not explain a possible relationship between variables when the null hypothesis is rejected
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