Use the “barci” program code provided. Read the program code to understand

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

Task 1. Use the “barci” program code provided. Read the program code to understand what it is doing (creating a twoway bar graph with confidence intervals around each mean). Week 4 Lecture 1 goes over some of the code.

1. Modify the program as follows:

a. add a ttest of difference of means to the barci program

b. display results on graph with twoway, note() option.

C.

save ttest results with return command.

d. make the t test optional.

e.

pass level parameter to ttest.

Run the program to compare mean wage by college graduation status (Yes/No) using nlsw88.dta data. Your command should look as follows: "barci wage, by(collgrad) ttest |(95)"

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