The following table gives pairs of dependent and independent variables. In each case state whether you would expect the relationship between the two variables to be positive, negative, or uncertain. In other words, tell whether the slope coefficient will be positive, negative, or neither. Give a brief justification in each case.

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Dependent variable Independent variable (a) GDP (b) Personal savings (c) Yield of crop (d) U.S. defense expenditure (e) Number of home runs hit by Rate of interest Rate of interest Raintall Soviet Union's defense expenditure Annual salary a star baseball player (f) A president's popularity (g) A student's first-year grade- Length of stay in office S.A.T score point average (h) A student's grade in econometrics () Imports of Japanese cars Grade in statistics U.S. per capita income