Question
In: Math
The scores 30 students earned on the Calculus I final exam are listed in the data...
The scores 30 students earned on the Calculus I final exam are listed in the data set below (in percentage).
examscores=c(95,68,65,50,82, 85,91,83,70,67, 68,65,52,39,48, 75,65,70,68,65, 69,71,68,73,78, 80,51,65,64,87)
Include your R commands and output for each part of the problem.
a) Create a stem and leaf plot for this data.
b) Comment on at least three features of the distribution using statistical terminology.
c) One of the data values is 39%. Would that value be considered unusual? Show work to justify your answer.
d) One of the data values is 39%. Would that value be considered an outlier? Show work to justify your answer.
Solutions
milcah answered 1 year agoRelated Solutions
The data below are the final exam scores of 5 randomly selected calculus students and the...
The data below are the final exam scores of 5 randomly selected
calculus students and the number of hours they slept the night
before the exam.
Hours, x
4
6
3
9
3
Scores, y
74
89
69
90
75
a) Draw scatterplot for the data.
b) Calculate the linear correlation coefficient to 3 decimal
places.
(if you are unable to calculate the linear correlation
coefficient, use .9 for part c,d and e)
c) Is there a linear relationship between...
The data below are the final exam scores of 10 randomly selected calculus students and the...
The data below are the final exam scores of 10 randomly selected
calculus students and the number of hours they slept the night
before the exam:
Hours Slept (x)
7
11
6
13
7
8
8
11
12
9
Exam Scores (y)
68
83
63
91
69
81
88
93
93
74
Using the equation of the regression line, with all numbers in
it rounded to 2 decimal places, predict the final exam score of a
student who slept for...
An investigator collected data on midterm exam scores and final exam scores of elementary school students;...
An investigator collected data on midterm exam scores and
final exam scores of elementary school students; results can
summarized as follows.
Average SD
--------------------------------------------------
Boys' midterm score 70 20
Boys' final score 65 23
girls' midterm score 75 20
girls' final score 80 23
The correlation coefficient between midterm score and final
score for the boys was about 0.70; for the girls, it was about the
same. If you take the boys and the girls together, the correlation
between midterm...
The following are final exam scores for 30 students in an elementary statistics class.
The following are final exam scores for 30 students in an
elementary statistics class.
91
59
82
91
79
76
90
69
77
83
59
88
95
72
88
81
77
52
80
96
62
97
76
75
75
89
61
72
90
85
a.
Find the quartiles for this data______________________________.
b.
What is the Interquartile Range (IQR)_________________________?
c.
What percent of students got at least a 72 on their final
exam______________?
d.
Build a boxplot using the graphing calculator.
The following data represent the final exam scores of 18 male students and 18 female students....
The following data represent the final exam scores of 18 male
students and 18 female students.
Male: 68, 68, 72, 73, 65, 74, 73, 72, 68, 65, 73, 66, 71, 68, 74,
66, 71, 65
Female: 59, 75, 70, 56, 66, 75, 68, 75, 62, 60, 73, 61, 75, 74, 58,
60, 73, 58
Is there any significant difference between the average exam scores
of male and female students?
Explain your answer
using both confidence interval method and hypothesis test...
Below are the final exam scores of 20 Introductory Statistics students.
Below are the final exam scores of 20 Introductory Statistics students.
Student
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Score
71
76
77
77
79
80
80
80
81
81
84
84
85
86
86
86
86
87
89
93
The mean exam score is 82.4 with a standard deviation of 5.14.
1. How many of the exam scores in the sample are within one standard deviation...
These are the scores of 40 students in MAT that took the Final Exam. Perform the...
These are the scores of 40 students in MAT that took the
Final Exam. Perform the computations asked below with this set of
data:
88
91
50
65
46
99
72
82
66
75
70
58
86
83
68
82
59
98
64
82
99
58
20
63
64
39
81
89
96
101
83
56
93
84
70
22
105
81
102
77
1. What is the class mean of the test scores? Round to the
nearest whole number....
A sample of 10 students record their scores on the final exam for their statistics class....
A sample of 10 students record their scores on the final exam
for their statistics class. The mean of the sample is 81 with
sample standard deviation 7 points. Analysis of the 10 sample
values indicated that the population is approximately normal. We
wish to find the 95% confidence interval for the population mean
test scores.
1. What is the confidence level, c?
2. Which of the following is correct?
a. To find the confidence interval, a z-critical value should...
for a final exam in statistics , the mean of the exam scores is u= 75...
for
a final exam in statistics , the mean of the exam scores is u= 75
with a standard deviation of o=8. what sample mean marks the top
10% of this distribution for a samples of n= 25
b) what sample means mark the boundaries of the middle 50% for
samples of n= 50
Final exam scores in a Math class with large number of students have mean 145 and...
Final exam scores in a Math class with large number of students
have mean 145 and standard deviation 4.1. Provided the scores of
this Final exam follow a normal distribution, what's the
probability that a student scores below 145 OR above 157.3? Find
the answer without using the
LSND program. (Write the answer in decimals)
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