Below is a file with instructions.
For sections 2.4(#37) and 2.5 (#45) you must use the excel file attached to answer the questions. The first screenshot (88) isfor 2.4 (#37) and the third file of screenshot (89) is for 2.5
Claudia Pena
September 10, 2023
BUS219
Chapter 2 – Book Exercises
2.1
#1 Fifty pro-football rookies were rated on a scale of 1 to 5, based on performance at a training camp as well as on past performance. A ranking of 1 indicated a poor prospect, whereas a ranking of 5 indicated an excellent prospect. The following frequency distribution was constructed.
|
Rating |
Frequency |
|
1 |
4 |
|
2 |
10 |
|
3 |
14 |
|
4 |
18 |
|
5 |
4 |
a.) How many of the rookies received a rating of 4 or better? How many of the rookies received a rating of 2 or worse?
· The rookies who received a rating of 4+ are 22 and the ones who received a rating of 2 or worse are 14.
b.) Construct the relative frequency distribution. What proportion received a rating of 5?
·
c.) Construct a bar chart. Comment on the findings.
·
2.2
#13 The following contingency table shows inspection records for 630 units of a particular product. The records have been cross-classified by the inspector’s decision (Pass and Fail) and the inspector’s experience (Low, Medium, and High).
|
Experience |
|||
|
Decision |
Low |
Medium |
High |
|
Pass |
152 |
287 |
103 |
|
Fail |
16 |
46 |
26 |
a.) How many of the units passed inspection? How many of the units failed inspection?
·
b.) How many of the units were inspected by inspectors with high experience?
·
c.) What proportion of the units were inspected by inspectors with low experience?
·
d.) What proportion of the units were inspected by inspectors with medium experience and failed inspection?
·
2.3
#20 Consider the following frequency distribution:
|
Interval |
Frequency |
|
1,000 < x ≤ 1,100 |
22 |
|
1,100 < x ≤ 1,200 |
38 |
|
1,200 < x ≤ 1,300 |
44 |
|
1,300 < x ≤ 1,400 |
16 |
a.) Construct the relative frequency distribution. What proportion of the observations are more than 1,100 but no more than 1,200?
·
b.) Construct the cumulative frequency distribution. How many of the observations are 1,300 or less?
·
c.) Construct the cumulative relative frequency distribution. What proportion of the observations are 1,300 or less? More than 1,300?
·
2.4
#37 FILE Test_Scores. The accompanying table shows a portion of midterm and final grades for 32 students.
|
Student |
Final |
Midterm |
|
1 |
86 |
78 |
|
2 |
94 |
97 |
|
⋮ |
⋮ |
⋮ |
|
32 |
91 |
47 |
a.) Construct a scatterplot of Final against Midterm. Describe the relationship.
2.5
#45 FILE Exercise_2.45 . The accompanying data file contains 20 observations for Variable X.
Construct a stem-and-leaf diagram. What are the lowest and highest observations?
Is the distribution symmetric? Explain.
