School administrators collect data on students attending the school. Which of the following variables is quantitative?

A professor has kept records on grades that students have earned in his class. If he wants to examine the % of students earning the grades A, B, C, D, and F during the most recent term, which kind of plot would he make?

2 sections of a class took the same quiz. Section A has 15 students who had a mean score of 80, and Section B had 20 students with a mean score of 90. Overall, what was the approximate mean score for all of the students on the quiz?

Suppose that a normal model described student scores in a history class. Parker has a standardized score (z-score) of +2.5. This means that Parker:

Your Stats teacher tells you that your test score was in the 3rd quartile for the class. Which is true?

I) You got 75% on the test

II) You can't really tell what this means without knowing the standard deviation

III) You can't really tell what this means unless the class distribution is nearly normal

The advantage of making a stem and leaf display instead of a dotplot is that a stem and leaf display:

The 5 number summary of credit hours for 24 students in a statistics class is:
Min:13
Q1:15
Median: 16.5
Q3: 18
Max: 22
From the info we know:

Which of the followinf data summaries are changed by adding a constant to each data value?

I) the mean

II) the median

III) the standard deviation

If we want to discuss gaps and clusters in a data set, which of the following should NOT be chosen to display the data set?

All BUT one of these statements contain a mistake. Which one is true?