Question

1.State College area blood bank center dataset includes the zip codes of the blood donors, such as

16801 16802 16803 16804 16805

What is your opinion: Is the zip code categorical or quantitative variable? Explain your answer.

2.Suppose at the end of the semester I decided to curve the grades of my class by adding 5 points to each student. What do you think will happen to the class mean and the median? How about standard deviation and the IQR? Explain

Answer 1

1.State College area blood bank center dataset includes the zip codes of the blood donors, such as

16801 16802 16803 16804 16805

What is your opinion: Is the zip code categorical or quantitative variable? Explain your answer.

Answer:

The zip code is a categorical variable because it does not explain any quantity and it only explains the specific regions of areas for which we assign the zip codes.

2.Suppose at the end of the semester I decided to curve the grades of my class by adding 5 points to each student. What do you think will happen to the class mean and the median? How about standard deviation and the IQR? Explain

Answer:

When we add 5 points to grade of each student, then mean and median will be increases by 5 points. Means and median will be shifted towards right by 5 points. There is a constant and steady increment in each grade, so there would be nothing changes in the values of standard deviation and IQR. For IQR, Q3 and Q1 both will be increases accordingly and that’s why there will be no any change in the IQR.