The sales manager for the Fox News TV station affiliate in a southern Florida city recently surveyed 20 advertisers and asked each one to rate the service of the station on the following scale:

He also tracked the general time slot when the advertiser’s commercials were shown on the station. The following codes were used:
1 = morning 2 = afternoon
3 = evening 4 = various times
The following sample data were observed:

a. Construct separate relative frequency distributions for each of the two variables.
b. Construct a joint frequency distribution for these two variables.
c. Construct a joint relative frequency distribution for these two variables. Write a short paragraph describing what the data imply.