本次美国代写是一个R计量经济学的限时测试
Question 1:
In your own words, describe the difference between R-squared, adjusted R-squared and the
standard error of the regression (SER)? (3 marks)
Question 2:
Under what conditions should you be concerned about potential omitted variable bias? (3 marks)
Question 3:
Open R-Studio.
Imagine that you have collected data from 10 companies on their sales.
Define a variable Sales, which records your sample of data.
Your observations are
Company Sales
A 3052
B 3005
C 5023
D 7903
E 4295
F 3237
G 6396
H 5921
I 4541
J 5901
Use R to calculate the mean value of sales in your sample. Give your answer to 2 decimal
places. (3 marks)
Question 4:
Use R-Studio to calculate the standard deviation. (base on question 3)
Question 5(base on question 3):
Let Y ~ N(28.4,38.5)
Calculate the 95% quantile of the distribution. That is, find a value, yi, such that
Give your answer to 2 decimal places.