The following data pertain to x, the amount of fertilizer (in pounds) that a farmer applies to his soil, and y, his yield of wheat (in bushels per acre):
Assuming that the data can be looked upon as a random sample from a bivariate normal population, calculate r and test its significance at the 0.01 level of significance. Also, draw a scattergram of these paired data and judge whether the assumption seems reasonable.
Answer to relevant QuestionsWith reference to Exercise 14.67, use the formula obtained in Exercise 14.31 to construct a 99% confidence interval for ρ. In exercise Formula Rework 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 data were collected to determine the relationship between two processing variables and the hardness of a certain kind of steel: Fit a plane by the method of least squares, and use it to estimate the average ...Prove Theorem 15.4. Theorem 15.4 Where T·j is the total of the values obtained for the jth block, T.. is the grand total of all nk observations, and Is the correction term. The following are the numbers of words per minute that a secretary typed on several occasions on four different typewriters: Use the computing formulas of Exercise 15.4 to calculate the sums of squares required to test at ...
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