A student's t-test would be useful in
(A). testing the significance of difference of two sample means
(B). testing the stationarity of a time series
(C). testing the significance of correlation coefficient
(D). testing the significance of a regression coefficient
(E). testing the goodness of fit of a model
Choose the correct answer from the options given below:
1
(A), (B) and (C) only.
2
(B), (C) and (D) only.
3
(A), (C) and (D) only.
4
(A), (B). (D) and (E) only.