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An assumption for a significance test of the correlation coefficient is that the populations, the variance of each variable is the same at each point of the other variable. Are there other assumptions to correlation coefficient? What happens if these assumptions are not met? What two numbers do you need to figure the t score for the significance test of a correlation coefficient between X and Y?
Formulate the hypotheses to determine whether or not the lathe is in perfect adjustment.
The dean of a nursing school claims that the average starting salary of its graduates is more than 60 (in $000's). It is known that the population standard deviation is 10 (in $000's).
It does not matter, when data are skewed mean and median are the same.
Suppose the weight of a product is normally distributed with a mean of 1.5 and a variance of 0.2. What percentage of products will have weights within +/- 3 standard deviations? Critically discuss the lower and upper limits bounding 50% of product we..
What sample size would be required to obtain the error of ±10 square millimeters with 99 percent confidence?
The mean is a useful measure, but it can be misleading. Describe a circumstance when the mean is very useful as the average and a circumstance when the mean is very misleading as the average.
Determine the proportion of variation in grade that can be explained by the linear correlation between the grade and the number of credit hours earned at the same time of taking the course.
This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
Suppose the manufacturers claim is right, determine the probability the mean of sample is 47,840 miles or less?
Perform a chi-square test on the following data:
A permutation resample for a two-sample test
Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study
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