A professor has kept records on grades that students have earned in his class. If he wants to ...

A professor has kept records on grades that students have earned in his class. If he wants to examine the percentage of students earning the grades A, B, C, D, and F during the most recent term, which kind of plot could he make?
 
  A) dotplot B) histogram C) timeplot D) pie chart E) boxplot

Q. 2

Which of the following variables would most likely follow a Normal model?
 
  A) scores on an easy test
  B) family income
  C) heights of singers in a co-ed choir
  D) weights of adult male elephants
  E) all of these

Q. 3

School administrators collect data on students attending the school. Which of the following variables is quantitative?
 
  A) whether the student is in AP classes
  B) whether the student has taken the SAT
  C) class (freshman, soph., junior, senior)
  D) grade point average
  E) none of these

Q. 4

Students taking an intro stats class reported the number of credit hours that they were taking that quarter. Summary statistics are shown in the table.
 
  16.65
  s 2.96
  min 5
  Q1 15
  median 16
  Q3 19
  max 28
  a. Suppose that the college charges 73 per credit hour plus a flat student fee of 35 per quarter. For example, a student taking 12 credit hours would pay 35 + 73(12 ) = 911 for that quarter.
   i. What is the mean fee paid?
   ii. What is the standard deviation for the fees paid?
   iii. What is the median fee paid?
   iv. What is the IQR for the fees paid?
  b. Twenty-eight credit hours seems like a lot. Would you consider 28 credit hours to be unusually high? Explain.

Q. 5

The five-number summary for midterm scores (number of points; the maximum possible score was 50 points) from an intro stats class is:
 
  Min Q1 Median Q3 Max
  16.5 32 39 43.5 48.5
  a. Would you expect the mean midterm score of all students who took the midterm to be higher or lower than the median? Explain.
  b. Based on the five-number summary, are any of the midterm scores outliers? Explain.

Q. 6

On Monday, a class of students took a big test, and the highest score was 92. The next day, a student who had been absent made up the test, scoring 100.
 
  Indicate whether adding that student's score to the rest of the data made each of these summary statistics increase, decrease, or stay about the same:
  a. mean
  b. median
  c. range
  d. IQR
  e. standard deviation