Question

Question 7 3 pts Suppose that you have 50 observations on the variables Y and X. If the sample correlation coefficient is 0.5 (r=0.5), and you want to test the null hypothesis that the true population correlation coefficient (rho) is equal to zero, then the test statistic associated with this null hypothesis is: o 5 04 O2 O 3 Question 8 3 pts Suppose you estimate a multiple regression model using OLS and the coefficient of determination is very high (above 0.8), while none of the estimated coefficients are (individually) statistically different from zero at the 5-percent level of significance. The most likely reason for this result is: o omitted variable bias. o serial correlation. o spurious regression. o multicollinearity. Question 9 3 pts Consider the scatter diagram below: 20 40 60 80 100 X This most likely illustrates the problem of o homoskedasticity o heteroskedasticity o multicollinearity o serial correlation

Answer 1

7)

The test statistic for testing for correlation coefficient is given by:

Hence 2nd option.

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