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You calculate the correlation for a set of scores for one group of subjects. You then add in the scores for another group of subjects and recalculate the correlation coefficient for the combined group. If the additional subjects scores fall outside the range of the original subjects scores, what will be the impact on the recalculated correlation coefficient?
A. It will increase.
B. It will decrease.
C. It will remain the same.
D. There is not enough information to tell.
From her district, consisting of several hundred stores, she selects a random sample of 30 stores. For each store she gathered the following information.
To compare the effectiveness of three types of pain relievers, a homogeneous group of 22 students were divided randomly into three groups, and each group took one of three pain relievers for a period of 2 weeks.
Create appropriate graphical displays for both groups, and write a brief report comparing their cholesterol levels. Here are the data:
A critic says, "Aha! You claim 90%, but in your sample the on-time percentage is lower than that. So the 90% claim is wrong."
Construct a 95% confidence interval for the proportion of all those who experience some type of discomfort.
A sampling distribution is a distribution of all sample means or sample variances that could be obtained in samples of a given size from the same population.
If we assume that the height of adult males in the US are normally distributed find the 99% confidence interval for the mean height of all US males.
Using the appropriate statistical table, what is the most accurate statement we can make about the p-value for the test? Construct and interpret the 90% confidence interval for the difference between the population means.
Given the following data, 1) how do you make Excel create a scatter diagram for you? 2) If you were to draw a line through the points, how straight would the line be?
How many of the 500 intervals would you expect not to capture the true population mean? Explain by showing your calculation.
The 46 computer mice inspectors at a particular factory can only inspect 45 mice per hour. Does the company have reason to believe that these inspectors are slower than average at α = 0.10?
Find the transformation matrix, Y=TX, such that has a covariance matrix of T such that Y has a covariance matrix.
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