Question

An
educational researcher sought to determine the average number of
friends that student on a particular college campus made during
their first year of school. Questioning a random sample of 50
students completing their freshmen year, he finds a sample mean of
3 friends and a standard deviation of 1. Separately, construct a
95% confidence interval and a 99% confidence interval to estimate
the mean number of friends made by the population of college
students during their first year on campus.

Answer #1

A researcher is trying to determine whether there is a
difference in the number of new friends that students make during
their freshman year based on whether they live on or off campus.
The descriptive statistics for the two groups are presented below.
Conduct the appropriate hypothesis test to determine whether there
is a significant difference in the number of new friends made.
On-Campus Freshmen
Off-Campus Freshmen
X1 = 4.48 s1 =1.81 N1 =16
X2 =3.61 s2 =1.86 N2 =16...

A researcher is trying to determine whether there is a
difference in the number of new friends that students make during
their freshman year based on whether they live on or off campus.
The descriptive statistics for the two groups are presented below.
Conduct the appropriate hypothesis test to determine whether there
is a significant difference in the number of new friends made.
On-Campus Freshmen
Off-Campus Freshmen
X1 = 4.48 s1 =1.81 N1 =16
X2 =3.61 s2 =1.86 N2 =16...

A student researcher compares the heights of American students
and non-American students from the student body of a certain
college in order to estimate the difference in their mean heights.
A random sample of 12 American students had a mean height of 67.9
inches with a standard deviation of 2.08 inches. A random sample of
18 non-American students had a mean height of 64 inches with a
standard deviation of 1.62 inches. Determine the 99 % confidence
interval for the...

Student Debt – Vermont: The average student loan debt of a U.S.
college student at the end of 4 years of college is estimated to be
about $21,900. You take a random sample of 146 college students in
the state of Vermont and find the mean debt is $23,000 with a
standard deviation of $2,200. You want to construct a 99%
confidence interval for the mean debt for all Vermont college
students.
(a) What is the point estimate for the...

A student researcher compares the heights of American students
and non-American students from the student body of a certain
college in order to estimate the difference in their mean heights.
A random sample of 1818 American students had a mean height of
68.168.1 inches with a standard deviation of 3.133.13 inches. A
random sample of 1212 non-American students had a mean height of
64.364.3 inches with a standard deviation of 1.841.84 inches.
Determine the 99%99% confidence interval for the true...

An education researcher is interested in studying student
performance on the SAT. The researcher takes a random sample of 200
students and calculates a sample mean of 500 and a sample standard
deviation of 70.
19. Calculate the standard error of the mean.
Answer: ____________________
21. Calculate the 99% confidence interval.
Answer: ____________________

A student researcher compares the heights of American students
and non-American students from the student body of a certain
college in order to estimate the difference in their mean heights.
A random sample of 12 American students had a mean height of 71.3
inches with a standard deviation of 2.43 inches. A random sample of
18 non-American students had a mean height of 65.6 inches with a
standard deviation of 3.19 inches. Determine the 99% confidence
interval for the true...

Answer the following questions and be sure to show your
work:-
1. Based on a sample of college students, a researcher
calculates a 95% confidence interval of the number of drinks per
week consumed. The result is 4.5 ± 1 drink. Based on a sample of
college students from a different institution, a researcher
calculates a 95% confidence interval of the number of drinks per
week consumed and finds a result of 8.5 ± 2 drinks. What if
anything can...

A
researcher wishes to estimate the average amount a college student
makes over the summer. Assume that the standard deviation for the
incomes of all college students during the summer is $400.
1. How large of a sample is necessary so that the margin of
error in a 90% confidence interval is less than $50?
2. How large of a sample is necessary so that the margin of
error in a 95% confidence interval is less than $50?
work and...

Many people believe that the average number of Facebook friends
is 130. The population standard deviation is 36.9. A random sample
of 39 high school students in a particular county revealed that the
average number of Facebook friends was 150. At =α0.01, is there
sufficient evidence to conclude that the mean number of friends is
greater than 130?

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