Question

Complete the following problems:

Hours |
37 |
29 |
14 |
42 |
34 |
7 |
24 |
21 |
34 |
44 |
29 |
34 |
26 |
33 |
17 |
21 |
28 |
15 |
33 |
38 |

Grade |
82 |
80 |
42 |
96 |
87 |
30 |
76 |
71 |
92 |
97 |
98 |
57 |
87 |
97 |
48 |
60 |
68 |
70 |
79 |
99 |

An experiment was done to determine if the amount of study hours
affect the grade earned by all students in a Business class. Using
the above data from the **population**, find the
following:

Median, Mean, Range and Standard Deviation of Study Hours:

Max, Min, Interquartile Range and Variance of Grades:

Correlation Coefficient, r. Is it positive or negative correlation? What does that mean?

Construct a scatter plot of your data. Using a Regression Analysis, what grade would you expect if you studied for 40 hours?

Answer #1

Median, Mean, Range and Standard Deviation of Study Hours:

Ans: Median=29, Mean=28, Range=37 and Standard Deviation=9.84

Max, Min, Interquartile Range and Variance of Grades:

Ans: Max=99, Min=30, Interquartile Range=33 and Variance=402.69

Pearson correlation of Hours and Grade = 0.813, it is a positive correlation. This means that increase the value of Study Hours increases the value of Grades or vice versa.

The scatter plot of data.

The regression equation is

Grade = 29.38 + 1.66 Hours

The expected grade for 40 hours study 29.38 + 1.66 *40=95.73.

Student Grades
Student
Test
Grade
1
76
62
2
84
90
3
79
68
4
88
84
5
76
58
6
66
79
7
75
73
8
94
93
9
66
65
10
92
86
11
80
53
12
87
83
13
86
49
14
63
72
15
92
87
16
75
89
17
69
81
18
92
94
19
79
78
20
60
71
21
68
84
22
71
74
23
61
74
24
68
54
25
76
97...

Using the accompanying Student Grades data, construct a scatter
chart for midterm versus final exam grades and add a linear
trendline. What is the model? If a student scores 7878 on the
midterm, what would you predict her grade on the final exam to
be?
Student
Midterm
Final Exam
1
75
64
2
85
91
3
80
68
4
88
83
5
76
60
6
67
80
7
78
74
8
95
94
9
67
61
10
93
87
11...

20) Which of the following measures of central tendency
will always change if a single value in the data
changes?
A) Mean
B) Median
C) Mode
D) All of these
2) She wants to determine if there is a positive linear
correlation between study hours and final paper score for the
students still left in his class at the end of the semester. He
randomly selected ten students from all his statistics classes and
determined their number of study hours...

A business statistics professor gives 100-point exams to two
different sections of business statistics. The scores in one
section, Section 001, of the class were 40, 50, 61, 63, 67, 74, 74,
76, 76, 78, 78, 80, 82, 86, 87, 87, 87, 88, 90, 90, 91, 92, 92, 93.
The other class, Section 002, had scores of 67, 67, 68, 75, 75, 76,
79, 79, 80, 80, 80, 83, 86, 87, 87, 88, 89, 89, 90, 90, 90,
91.
Based...

A sample was taken of the salaries of 24 employees of a large
company. The following are the salaries (in thousands of dollars)
for this year. For convenience, the data are ordered.
57
61
62
63
64
65
66
68
68
69
70
73
73
75
76
79
81
81
82
87
96
104
108
110
Find the following statistics:
Median
Range
Q1
Q2
Q3
IQR
Construct a box plot for the given data.
Based on your results from part...

This dataset contains consumer responses indicating the number
of times they had to send their product for repair and their
satisfaction with the repair process. Create a graph which can be
used to visually demonstrate the relationship between the two
columns of data. Ensure that the chart is professional with
appropriate titles, axis labels, etc. Note any observations you see
in your visualization (type these as sentences directly into an
Excel cell(s)).
Sample
Satisfaction Rating
Repair Requests
1
63%
13...

The Data
A central tenet to being a good instructor, I believe, is to be a
reflective practitioner of your craft. From time to time I find it
to be necessary to review and reflect on my work as an instructor
from a grade perspective. On our moodle page you will find a link
to a second word document titled “300 Grades”. This data sheet
contains both the alphanumeric grade (page 1) and the numerical
equivalent (page 2) for every...

Question 2:
Write a C program that read 100 integers from the attached file
(integers.txt) into an array and copy the integers from the array
into a Binary Search Tree (BST). The program prints out the
following:
The number of comparisons made to search for a given integer in the
BST
And
The number of comparisons made to search for the same integer in
the array
Question 3
Run the program developed in Question 2 ten times. The given values...

Q1 )Find the 1st quartile, 2nd quartile, third quartile and the
interquartile range of the following data set
72, 74, 75, 77, 79, 82, 83, 87, 88, 90, 91, 91, 91, 92, 96, 97,
97, 98, 100
The 1st Quartile :
The 2nd Quartile :
The 3rd Quartile :
The IQR :
Q2)
According to the empirical rule, if a population has a normal
distribution, approximately what percentage of values is within
one, two and three standard deviation of the...

Given here are data for a dependent variable and four potential
predictors.
y
x1
x2
x3
x4
x5
96
8
60
2.4
48
51
73
6
64
2.1
42
43
108
2
76
1.8
34
20
124
5
74
2.2
11
14
82
6
50
1.5
61
29
89
9
57
1.6
53
22
76
1
72
2
72
38
109
3
74
2.8
36
40
123
2
99
2.6
17
50
125
6
81
2.5
48
55
101
2...

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