Question
In: Statistics and Probability
High school graduates: The National Center for Educational Statistics reported that 82% of freshmen entering public...
High school graduates: The National Center for Educational Statistics reported that 82% of freshmen entering public high schools in the U.S. in 2009 graduated with their class in 2013. A random sample of 135 freshmen is chosen.
|
a. |
Page 333 Find the mean μ. |
|
b. |
Find the standard deviation σ. |
|
c. |
Find the probability that less than 80% of freshmen in the sample graduated. |
|
d. |
Find the probability that the sample proportion of students who graduated is between 0.75 and 0.85. |
|
e. |
Find the probability that more than 75% of freshmen in the sample graduated. |
|
f. |
Would it be unusual if the sample proportion of students who graduated were more than 0.90? |
Solutions
orchestra answered 2 years agoRelated Solutions
High school graduates: Approximately 78% of freshmen entering public high schools in the United States in...
High school graduates: Approximately 78% of
freshmen entering public high schools in the United States in 2005
graduated with their class in 2009. A random sample of 128 freshmen
is chosen.
(a)Find the mean μp
.(b)Find the standard deviation σp
.
(c)Find the probability that less than 91% of freshmen in the
sample graduated.
(d)Find the probability that between 68%and 83% of freshmen in
the sample graduated.
(e)Find the probability that more than 68%of freshmen in the
sample graduated.Cumulative Normal...
High school graduates: Approximately 78% of freshmen entering public high schools in the United States in...
High school graduates: Approximately
78%
of freshmen entering public high schools in the United States
in
2005
graduated with their class in
2009
. A random sample of
128
freshmen is chosen. Use
(a)Find the mean
μp
.(b)Find the standard deviation
σp
.
(c)Find the probability that less than
91%
of freshmen in the sample graduated.
(d)Find the probability that between
68%
and
83%
of freshmen in the sample graduated.
(e)Find the probability that more than
68%
of freshmen in...
High school graduates: Approximately 74% of freshmen entering public high schools in the United States in...
High school graduates: Approximately
74%
of freshmen entering public high schools in the United States
in
2005
graduated with their class in
2009
. A random sample of
175
freshmen is chosen. Use Cumulative Normal Distribution Table as
needed. Round your answers to at least four decimal places if
necessary.
(a)Find the mean
μp
.
The mean
μp
is .
Part 2 of 6
(b)Find the standard deviation
σp
.
The standard deviation
σp
is .
Part 3 of 6...
The National Center of Education Statistics conducted a survey of high school seniors,
5.20 High School and Beyond, Part I: The National Center of Education Statistics conducted a survey of high school seniors, collecting test data on reading, writing, and several other subjects. Here we examine a simple random sample of 200 students from this survey. Side-by-side box plots of reading and writing scores as well as a histogram of the differences in scores are shown below. (b) Create hypotheses appropriate for the following research question: is there an evident difference in the average...
The National Center of Education Statistics conducted a survey of high school seniors
High School and Beyond, Part l. The National Center of Education Statistics conducted a survey of high school seniors, collecting test data on reading, writing, and several other subjects. Here we examine a simple random sample of 200 students from this survey. A histogram of the difference in the reading and writing score of each student is shown below. .1. Which set of hypotheses is appropriate for the following research question: is there an significant difference in the average scores of students...
2. As reported by the U.S. national center for health statistics. The mean serum high density...
2. As reported by the U.S. national center for health
statistics. The mean serum high density lipoprotein cholesterol of
females 20 to 29 years old is μ=53, if serum HDL cholesterol is
normally distributed with σ=13.4, answer the following
questions:
A. What is the probability that a randomly selected female 20 to
29 years old has Serum cholesterol above 60?
B. What is the probability that a randomly sample of 15 female
20 to 29 years old has mean Serum...
74% of freshmen entering public high schools in 2006 graduated with their class in 2010. A...
74% of freshmen entering public high schools in 2006 graduated
with their class in 2010. A random sample of 81 freshmen is
selected. Find the probability that the proportion of students who
graduated is greater than 0.750 . Write only a number as your
answer. Round to 4 decimal places (for example 0.1048). Do not
write as a percentage.
The National Center of Education Statistics conducted a surveyof high school seniors, collecting test data...
The National Center of Education Statistics conducted a survey
of high school seniors, collecting test data on reading, writing,
and several other subjects. Here we examine a simple random sample
of 200 students from this survey. Side-by-side box plots of reading
and writing scores as well as a histogram of the differences in
scores are shown below.(a) Is there a clear difference in the average reading and
writing scores?(b) Are the reading and writing scores of each student
independent of...
Approximently 72% of freshmen entering public high schools in the United States in 2005 graduated with...
Approximently 72% of freshmen entering public high schools in
the United States in 2005 graduated with their class in 2009. A
random sample of 136 freshmen is chosen. around your answers to
four decimal places as needed.
Part 1 of 6
Find the mean u ^p is
The article "College Graduates Break Even by Age 33" reported that 5.7% of high school graduates...
The article "College Graduates Break Even by Age 33" reported
that 5.7% of high school graduates were unemployed in 2008 and 9.7%
of high school graduates were unemployed in 2009.† Suppose that the
reported percentages were based on independently selected
representative samples of 300 high school graduates in each of
these two years.
(a)Construct a 99% confidence interval for the difference in the
proportion of high school graduates who were unemployed in these
two years. (Use p2008 − p2009. Round...
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