The table at the bottom of the page shows how the history and economics scores of 25 students are distributed. Use the method of Exercise 14.32 to determine the value of r, replacing the row headings by the corresponding class marks (midpoints) 23, 28, 33, 38, 43, and 48 and the column headings by the corresponding class marks 23, 28, 33, 38, and 43. Use this value of r to test at the 0.05 level of significance whether there is a relation-ship between scores in the two subjects.
Answer to relevant QuestionsRework Exercise 14.71, coding the class marks of the history scores –2, –1, 0, 1, and 2 and the class marks of the economics scores –2, –1, 0, 1, 2, and 3. (It follows from Exercise 14.70 that this kind of coding ...The following are sample data provided by a moving company on the weights of six shipments, the distances they were moved, and the damage that was incurred: (a) Assuming that the regression is linear, estimate β0, β1, and ...(a) Use an appropriate computer program to fit a plane to the following data relating the monthly water usage of a production plant (gallons) to its monthly production (tons), mean monthly ambient temperature (°F), and the ...Develop the analysis-of-variance table for a Latin-square experiment. An experiment was performed to judge the effect of four different fuels and three different types of launchers on the range of a certain rocket. Test, on the basis of the following ranges in miles, whether there is a ...
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