In a simple linear regression problem, the following statistics are calculated from a sample of 10 observations: [pic]= 2250, [pic]= 10,	[pic] = 50,	[pic] = 75. The least squares estimates of the slope and y-intercept are respectively:
A. 1.5 and 0.5
B. 2.5 and 1.5
C. 1.5 and 2.5
D. 2.5 and –5.0
Answer:D
In a simple linear regression problem, the following statistics are calculated from a sample of 10 observations: [pic]= 2250, [pic]= 10,	[pic] = 50,	[pic] = 75. The least squares estimates of the slope and y-intercept are respectively:
A. 1.5 and 0.5 B. 2.5 and 1.5 C. 1.5 and 2.5 D. 2.5 and –5.0