Question
The average grade obtained on the test by its 25 students is an 83, with a...
The average grade obtained on the test by its 25 students is an 83, with a standard deviation of 11 points.
a. Approximately how many people received a failing grade (less than 65)?
b. What percentage of people received a grade between a 70 and a 91?
c. What percentage of individuals received a score whose z-score was -.70 or less?
d. What grade is required in order to be in the top 15 percent? The top 10 percent?
e. What percentage of people received a grade between 85 and 95?
f. What percentage of people received a grade of 94 or less?
g. What grade is required to be in the bottom 20%?
h. What z-score is required to be in the top 40%?
i. What percentage of individuals have a z-score between -1 and 1.40?
j. What percentage of individuals have a z-score between 1.05 and 1.40?
Homework Answers
Answer #1
Not the answer you're looking for?
Similar Questions
QUESTION 22 The results from a statistics class' first exam are as follows: The mean grade...
QUESTION 22 The results from a statistics class' first exam are
as follows: The mean grade obtained by its 25 students is 83, with
a standard deviation of 11. The distribution of grades was unimodal
and symmetrical. What percentage of individuals have a z-score
between -1 and 1.40 QUESTION 23 Suppose you have a tree farm and
you have 1000 live oaks on this farm. You are wondering if this
would be a profitable time to harvest the tallest ones...
8. In a statistics class, the average grade on the final examination was 75 with a standard...
8. In a
statistics class, the average grade on the final examination was 75
with a standard deviation of 5.
a.
Use Chebyshev’s theorem to answer: At least what percentage of
the students received grades between 50 and 100?
b.
What is the z-score for a student who had an examination score
of 91?
c. Would the test score from part b., be
considered an outlier? Explain.
9. Assume we have a symmetric or bell shaped distribution. Using...
1a.) The following grades were obtained on the Research Methods course of students of the Urban...
1a.) The following grades were obtained on the Research Methods
course of students of the Urban Studies Department at Stanford
University (70, 90, 85, 70, 85, 60, 95, 50, 65, 70). There were 95
students in the class. Variance of the data set is:
a.144
b.214
c.184
d.None of the above
1b.) The following grades were obtained on the Research Methods
course of students of the Urban Studies Department at Stanford
University (70, 90, 85, 70, 85, 60, 95, 50,...
You find out that the average 10th grade math score, for Section 6 of the local...
You find out that the average 10th grade math score, for
Section 6 of the local high school, is 87 for the 25 students in
the class. The average test score for all 10th grade math students
across the state is 85 for 1,800 students. The standard deviation
for the state is 3.8.
Answer the following questions:
What z score do you calculate?
What is the area between the mean and the z score found in
Appendix A of the...
A mathematics achievement test consisting of 100 questions was given to 50 sixth grade students at...
A mathematics achievement test consisting of 100 questions was
given to 50 sixth grade students at maple Elementary School. The
following data show the number of questions answered correct by
each student.
75 48 46 65 71 49 61 51 57 49 84 85 79 85 83 55 69 88 89 55 61
72 64 67 61 77 51 61 68 54 63 94 54 53 71 84 79 75 65 50 45 65 77
71 63 67 57 63...
Question 9-15 are based on the random sample below which is obtained to test the following...
Question 9-15 are based on the random
sample below which is obtained to test the following hypothesis
about the population mean. Test the hypothesis that the mean is
less than 80.
80
100
81
93
80
57
98
90
71
56
58
78
59
55
55
77
72
78
56
94
98
59
93
86
89
62
60
66
59
71
96
97
94
69
64
77
87
77
64
90
90
95
98
99
56
69
72
81
95...
A college administrator is interested in knowing whether a 3-week math mini-course affects a student's grade....
A college administrator is interested in knowing whether
a 3-week math mini-course affects a student's grade. Twenty
students are randomly selected and given a math test. These
students then attend the mini-course and are retested. Assume the
paired data come from a normal population for which the mean
difference is 0 Compute the value of the t-test statistic and
p-value for the paired data. At the 1% significance level,
determine whether the mini-course actually improves a student's
score.
Pre-course 68...
Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a...
Scores of an IQ test have a bell-shaped distribution with a
mean of 100 and a standard deviation of 17. Use the empirical rule
to determine the following. (a) What percentage of people has an
IQ score between 83 and 117?
(b) What percentage of people has an IQ score less than 49 or
greater than 151?
(c) What percentage of people has an IQ score greater than
117?
. What information can you conclude from the area under a normal curve? b. What is...
. What information can you conclude from the area under a normal
curve?
b. What is the difference between standard normal distribution
and normal distributions?
c. Explain what a z-score is and its relationship to the
characteristics of a normal curve.
d. Can a z-score be negative? Why or why not?
e. What is the 68-95-99.7 rule for normal distributions?
f. Explain how it can be used to answer questions about
frequencies of data values in a normal distribution.
Psychology...
Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a...
Scores of an IQ test have a bell-shaped distribution with a
mean of 100 and a standard deviation of 15. Use the empirical rule
to determine the following.
(a) What percentage of people has an IQ score between 55 and
145?
(b) What percentage of people has an IQ score less than 85 or
greater than 115?
(c) What percentage of people has an IQ score greater
than130?
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 5 minutes ago
asked 19 minutes ago
asked 19 minutes ago
asked 19 minutes ago
asked 43 minutes ago
asked 45 minutes ago
asked 56 minutes ago
asked 57 minutes ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago
asked 1 hour ago