Question
In: Statistics and Probability
12 pts) Below is a set of exam 1 scores from our Statistics class. 7 of...
12 pts) Below is a set of exam 1 scores from our Statistics class. 7 of the scores come from females, and 7 come from males. Test the hypothesis that males and females scored differently on our first exam, using an alpha level of .05.
|
Male |
Female |
|
65 |
99 |
|
90 |
78 |
|
87 |
43 |
|
98 |
56 |
|
46 |
72 |
|
61 |
90 |
|
70 |
100 |
- (2 pts) What is the appropriate test? Two Sample test
- (1 pt) State the null hypothesis: Males and females did not the differently on first exam
- (1 pt) State the alternative hypothesis: Males and females did score differently on first exam
- (2 pts) Find the critical value: 2.178
- (3 pts) Calculate the obtained statistic: 0.785
- (2 pts) Make a decision:
- (1 pt) What does your decision mean?
Solutions
orchestra answered 1 year agoRelated Solutions
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.
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...
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...
The final exam scores in a statistics class were normally distributed with a mean of 70...
The final exam scores in a statistics class were normally
distributed with a mean of 70 and a standard deviation of five.
What is the probability that a student scored less than 55% on the
exam?
Exam grades: Scores on a statistics final in a large class were normally distributed with a...
Exam grades: Scores on a statistics final in a
large class were normally distributed with a mean of
70 and a standard deviation of 10. Use the TI-84 PLUS calculator
to answer the following. Round the answers to at least two
decimals.
(a) Find the 42nd percentile of the scores.
(b) Find the 71st percentile of the scores.
(c) The instructor wants to give an A to the students whose
scores were in the top 10% of the class. What...
The following data represent exam scores in a statistics class taught using traditional lecture and a...
The following data represent exam scores in a statistics class
taught using traditional lecture and a class taught using a
"flipped" classroom. Complete parts (a) through (c) below.
Traditional
71.071.0
69.969.9
80.580.5
67.567.5
84.384.3
77.677.6
57.057.0
82.582.5
81.281.2
70.970.9
64.364.3
70.370.3
60.160.1
Flipped
76.776.7
71.771.7
64.064.0
72.672.6
77.577.5
90.990.9
79.879.8
77.277.2
81.681.6
69.269.2
92.592.5
77.777.7
75.775.7
(a) Which course has more dispersion in exam scores using the
range as the measure of dispersion?
The traditional course has a range of...
The following data represent exam scores in a statistics class taught using traditional lecture and a...
The following data represent exam scores in a statistics class
taught using traditional lecture and a class taught using a
"flipped" classroom. Complete parts (a) through (c) below.
Traditional 71.7 69.2 78.7 68.1 84.1 78.5 56.9 81.0 82.0 72.3
63.7 69.0 60.5
Flipped 76.8 72.0 64.0 73.0 78.8 92.5 79.2 77.4 81.8 71.2 91.4
78.5 75.9
(a) Which course has more dispersion in exam scores using the
range as the measure of dispersion? The traditional course has a
range of...
Suppose the scores on a recent exam in your statistics class were as follows: 78, 96,...
Suppose the scores on a recent exam in your statistics class
were as follows: 78, 96, 60, 93, 55, 84, 76, 92, 62, 83, 80, 90,
64, 75, 79, 31, 75, 64, 99, 74, 88, 61, 82, 68, 79, 78, 80, 85. a)
Create a stemplot for these test scores using each 10s value once
on the stem and ordered leaves on each branch.
Refer to the test scores in the Question above
a) Create a histogram for the test...
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
Below is a data set for the scores on a quantum physics midterm exam for five...
Below is a data set for the scores on a quantum physics midterm
exam for five students vs. amount of time spent studying for it
Time Spent Studying (Hours)
Score
0.5
32
1
44
2
63
3.5
79
5
96
Find the equation of the best-fit line. You can do this through
Excel or calculating by hand (slope and y-intercept).
What does the slope physically represent? What does the
y-intercept physically represent?
Using your equation, if a student spent 4.3...
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