Question
In: Statistics and Probability
One hundred students were given an Algebra test. A random sample of ten students was taken...
One hundred students were given an Algebra test. A random sample of ten students was taken out of class of 800 enrolled students. The time it took each student to complete the test is recorded below.
22.2, 23.7, 16.8, 18.3, 19.7, 16.9, 17.2, 18.5, 21.0, and 19.7
a. Find the mean, variance and standard deviation for this sample of ten students
b. Construct a 95% confidence interval for the population mean time to complete this Algebra test.
c. Test if the population mean time to complete the test is 22.5 minutes.
Solutions
orchestra answered 1 year agoRelated Solutions
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A test of abstract reasoning is given to a random sample of
students before and after they completed a formal logic course. The
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distribution of such differences is approximately normal. Interpret
your result.
Before
74
83
75
82
80
63
93
84
91
77
After
73
77
70
77
74
67
95
83
84
75
In a random sample of 100 college students, scores on a test were normally distributed with...
In a random sample of 100 college students, scores on a test
were normally distributed with a mean of 80 points and standard
deviation of 12 points. Use this scenario to answer the following
questions:
A. In this scenario, what is the point estimate? [2 points]
B. Construct a 95% confidence interval to estimate the mean
score in the population of all college students. Remember to show
all work. Round your final answer to 3 decimal places. [4
points]
C....
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The graph illustrates the distribution of test scores taken by
College Algebra students. The maximum possible score on the test
was 110, while the mean score was 72 and the standard deviation was
8.
48 56 64 72 80 88 96 Distribution of Test Scores
What is the approximate percentage students who scored between 64
and 80 on the test?
What is the approximate percentage of students who scored between
56 and 88 on the test?
What is the approximate...
The graph illustrates the distribution of test scores taken by College Algebra students. The maximum possible...
The graph illustrates the distribution of test scores taken by
College Algebra students. The maximum possible score on the test
was 140, while the mean score was 76 and the standard deviation was
14.
34 48 62 76 90 104 118 Distribution of Test Scores
What is the approximate percentage of students who scored
between 62 and 76? %
What is the approximate percentage students who scored between
62 and 90 on the test? %
What is the approximate percentage...
11 The graph illustrates the distribution of test scores taken by College Algebra students. The maximum...
11
The graph illustrates the distribution of test scores taken by
College Algebra students. The maximum possible score on the test
was 140, while the mean score was 71 and the standard deviation was
15. 2641567186101116Distribution of Test Sco
Use the "Empirical Rule", not a calculator or other technology.
Do not round your answers.
What is the approximate percentage of students who scored
between 41 and 101 on the test?
%
What is the approximate percentage of students who scored...
The graph illustrates the distribution of test scores taken by College Algebra students. The maximum possible...
The graph illustrates the distribution of test scores taken by
College Algebra students. The maximum possible score on the test
was 140, while the mean score was 77 and the standard deviation was
14.
35
49
63
77
91
105
119
Distribution of Test Scores
What is the approximate percentage of students who scored
lower than 35 on the test?
%
What is the approximate percentage of students who scored
between 77 and 119 on the test?
%
What is...
The graph illustrates the distribution of test scores taken by College Algebra students. The maximum possible...
The graph illustrates the distribution of test scores taken by
College Algebra students. The maximum possible score on the test
was 110, while the mean score was 80 and the standard deviation was
7. 59 66 73 80 87 94 101 Distribution of Test Scores What is the
approximate percentage students who scored between 73 and 87 on the
test? Incorrect% What is the approximate percentage of students who
scored lower than 59 on the test? Incorrect% What is the...
Assume that an English comprehension test is given to a random sample of 12 students before...
Assume that an English comprehension test is given to a random
sample of 12 students before and after they complete an English
course. The tests taken before the course had x?
=105.75 points and s = 4.07 points. The tests were taken
after the course had x? = 113.08 points and s = 3.63 points.
Complete a hypothesis test to determine if the course improved
the test score using a significance level ? = 0.05.
A random sample of students from each class was taken and student GPAs were recorded. Determine...
A random sample of students from each class was taken and
student GPAs were recorded. Determine if there is evidence that the
mean GPA is not the same for all three groups. Use a 0.10 level of
significance.
Freshman
Sophomore
Junior
2.47
2.87
2.52
3.16
3.91
2.76
2.81
2.26
3.7
3.58
3.28
3.57
3.1
2.8
3.15
3.7
3.75
3.05
3.93
2.42
2.53
2.75
2.8
2.4
1.) What is the correct hypothesis statement?
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23.(8 pts) An algebra test is given to students at the beginning of a statistics course....
23.(8 pts) An algebra test is given to students at the beginning
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students and the results are given below. x = Algebra 80 78 75 63
84 y = Statistics 77 92 87 81 68 a. n = _____ r = ___________b0
=________ b1 = _____________ ?bar = __________
b. Test the claim that there is a linear correlation using the...
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