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A particular magazine typically has 65% subscription renewals. A new advertising campaign is introduced to see if this can be increased. To monitor renewals, a sample of 300 subscribers is taken each month to see what percentage renew their subscription. What are the upper and lower control limits for a control chart for the proportion of renewals? If there are 210 out of 300 renewals in a monthly sample, does this indicate that an increase in the overall renewal rate has occurred?
Compute the effect size with gender as the grouping variable and ADDSC as the dependent variable.
Compute the Kappa statistic and its standard error regarding reproducibility of the diagnosis of dyspnea in the clinic.
A school administrator randomly selects 12 classes from your school and then selects all of the students of those classes to study a school library issue. Which type of sampling design is being used.
Ages of 56 attendees of a Harry Potter movie are shown. (a) Form seven age classes (10 to 20, 20 to 30, etc.). Tabulate the frequency of attendees in each class.
If x is a binomial random variable where n=100 and p=.1, find the probability that x is less than or equal to 11 using the normal approximation to the binomial.
Determine the control limits for the mean and the range. Plot the control limits for the mean outside diameter and the range.
The results of a calculus exam are normally distributed with a mean of 76 and a standard deviation of 6. Find the percentage of students that scored above 70.
The quality control engineer for a furniture manufacturer is interested in the mean amount of force necessary to produce cracks in stressed oak furniture.
One state lottery has 1000 prizes of $1, 200 prizes of $5, 50 prizes of $25, 15 prizes of $150, 4 prizes of $500, and 1 prize of $2500. What is the lottery expected profit per ticket?
The random variable x, which is the number of occurrences of an event over an interval of ten minutes. It can be assumed that the probability of an occurrence is the same in any two time periods of an equal length.
Explain the purpose of the chi-square test for independence. Provide some practical examples where this test might be used in business.
Scatter plot, Correlation coefficient and Regression equation - Do a complete regression analysis by performing the steps below
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