Week One Homework Assignment - Statistics and Probability
The head of the chemistry department at a local university has tasked a student teaching assistant to prepare a variety of statistics pertaining to the final course grades earned by students who have completed the university’s CHEM 103 course during the past ten years. These statistics will be used as a basis for predicting the potential performance of future students who enroll in the course. A total of 1,125 students have completed the course during the past ten years. Rather than trying to have the teaching assistant collect and analyze data for all 1,125 students, the department head has agreed to allow the teaching assistant to prepare the necessary statistics using a random sample consisting of 25 students who completed the course during the past ten years. The following table summarizes the final course grades earned by the 25 randomly selected students.
|
Student No. |
Course Grade |
|
1 |
83.17 |
|
2 |
82.31 |
|
3 |
90.18 |
|
4 |
93.63 |
|
5 |
90.14 |
|
6 |
96.06 |
|
7 |
83.75 |
|
8 |
85.17 |
|
9 |
86.67 |
|
10 |
93.81 |
|
11 |
83.11 |
|
12 |
82.16 |
|
13 |
89.48 |
|
14 |
86.76 |
|
15 |
83.76 |
|
16 |
86.89 |
|
17 |
88.57 |
|
18 |
96.93 |
|
19 |
86.48 |
|
20 |
95.82 |
|
21 |
92.32 |
|
22 |
78.70 |
|
23 |
92.67 |
|
24 |
74.56 |
|
25 |
78.48 |
For the purposes of this assignment, assume that: (1) the sample consisting of 25 students is truly representative of the population of 1,125 students from which it was drawn; and (2) the 1,125 students who have completed the course during the past ten years constitute a truly representative sample of all future students who will eventually enroll in the course. Based upon these assumptions, use the sample data provided in the preceding table to answer the following questions.
Using the previously provided sample data for the final course grades earned by the 25 randomly selected students, determine the frequency, relative frequency and cumulative frequency for each of the following eleven grade classes.
|
Grade Classes |
|---|
|
0.00-10.00 |
|
10.00-20.00 |
|
20.00-30.00 |
|
30.00-40.00 |
|
40.00-50.00 |
|
50.00-60.00 |
|
60.00-70.00 |
|
70.00-80.00 |
|
80.00-90.00 |
|
90.00-100.00 |
|
100.00 or more |
The following table summarizes the grades for ten group projects for two groups of high school students.
|
Project No. |
Group 1 Grades |
Group 2 Grades |
|
1 |
96.11 |
99.22 |
|
2 |
87.65 |
96.44 |
|
3 |
84.35 |
73.61 |
|
4 |
92.01 |
84.32 |
|
5 |
98.69 |
68.51 |
|
6 |
83.65 |
95.58 |
|
7 |
78.35 |
96.97 |
|
8 |
88.89 |
77.49 |
|
9 |
94.94 |
89.35 |
|
10 |
77.22 |
86.99 |
Use the information in the preceding table to answer the following question.
A standard deck of playing cards consists of fifty-two cards. The cards in each deck consist of four suits, namely spades (♠), clubs (♣), diamonds (♦) and hearts (♥). Each suit consists of thirteen cards, namely ace, king, queen, jack, 10, 9, 8, 7, 6, 5, 4, 3, and 2. In the game of poker, a royal flush consists of the ace, king, queen, jack, and 10 of the same suit (e.g., ace of spades, king of spades, queen of spades, jack of spades and 10 of spades).
50 students in two sections of a college Physics 101 course recently took a mid-term exam. 13 students earned an A, 10 students earned a B, 8 students earned a C, 9 students earned a D and 10 students earned an F on the exam. The students were queried regarding the number of hours they had devoted to studying for the exam. 12 of the students who earned an A, 8 of the students who earned a B, 6 of the students who earned a C, 2 of the students who earned a D, and 1 of the students who earned an F reported that they had devoted more than 8 hours to studying for the exam. The remaining students reported that they had devoted no more than 8 hours to studying for the exam.
