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Question: An industry study was recently conducted in which the sample correlation between units sold and marketing expenses was 0.57. The sample size for the study included 15 companies. Based on the sample results, test to determine whether there is a significant positive correlation between these two variables. Use an α = 0.05.
Twenty-five samples of size 4 resulted in statistics of x=30.0 minutes and R = 2.5 minutes for the company to completely clean a rug. Compute control limits for x- and R-charts and estimate the standard deviation of the process.
If the amounts were costs and not benefits, which alternative would be superior? What conclusions can you draw from your answers to (a) and (b) about the influence of the timing of amount occurrence on economic evaluation.
Differences in the mean alcohol contents for the three levels of quality - Test for Homogeneity of Variances
in a recent survey concerning company sales and net earnings. 15 companies responded with the following
A catering company is buying equipment in order to set up their own store. They have a choice of two ovens that they can purchase for the store.
a newspaper finds that the mean number of typographical errors per page is four. find the probability that more than
Suppose also that after selecting 15 members at random we obtained the following paired observations: Use these data to find the covariance between age and the number of visits.
an elementary school class ran 1 mile in an average of 11 minutes with a standard deviation of 3 minutes. rachel a
Below is a partial multiple regression ANOVA table. Test the overall usefulness of the model at italic alpha =.01. Calculate F and make your decision about whether the model is useful for prediction purposes.
What are the center line and control limits for an x chart for this process?- Draw a separate chart for each of the three data sets. Mark any points that are beyond the control limits.
To find the expected frequencies, think about the chance of being correct or incorrect when there are three possible outcomes. Analyze the data with x2 and write a conclusion.
suppose an x distribution has mean icircfrac14 4. consider two corresponding x distributions the first based on
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