Question

Your professor wishes to estimate the proportion of ALL high school students enrolled in college-level courses each school year. A sample of 1500 students revealed that 18.3% were enrolled in college-level courses. Find the margin of error for a 95% confidence interval for a proportion.

Answer #1

A college admissions director wishes to estimate the mean age of
all students currently enrolled. In a random sample of 19 students,
the mean age is found to be 23.7 years. From past studies, the ages
of enrolled students are normally distributed with a standard
deviation of 10.4 years. Construct a 90% confidence interval for
the mean age of all students currently enrolled.
1. The critical value:
2. The standard deviation of the sample mean:
3. The margin of error...

A college registrar wants to estimate the proportion of all
students at the college who are dissatisfied with the online
registration procedure. What is the most conservative estimate of
the minimum sample size that would limit the margin of error to be
within 0.045 of the population proportion for a 95% confidence
interval?

A college admissions director wishes to estimate the mean age of
all students currently enrolled. In a random sample of 22 students,
the mean age is found to be 21.4 years. From past studies, the ages
of enrolled students are normally distributed with a standard
deviation of 10.2 years. Construct a 90% confidence interval for
the mean age of all students currently enrolled.
1. What is the Critical value?

A professor wishes to estimate the proportion of college
students that have never cheated
during a course. She wishes to estimate the proportion to be
within 4.15% with 96%
confidence. How many teenagers are needed for the sample?
A.
614
B.
612
C.
611
D.
613
E.
Insufficient information to answer the question

A researcher wishes to estimate the proportion of
college students who cheat on exams. A poll of 201 college students
showed that 27% of them had cheated on examinations. Find the
margin of error and identify an appropriate confidence interval.
State your final assessment in a complete sentence

A survey is planned to determine what proportion of high-school
students in a metropolitan school system have regularly smoked
marijuana. The school administrators would like to estimate the
proportion with 95 % confidence and a margin of error of no more
than 4%.
It was reported that 31.03% of high school students in a
similar metropolitan area regularly smoke marijuana. If this
estimate is used, what sample size would be required? n =
If the administrators choose not to use...

Find the sample size needed to estimate the proportion of
college students that are
freshmen so that the error is at most 3.5% for a 95% confidence
interval.

You want to estimate the proportion of students at your college
or university who are employed for 10 or more hours per week while
classes are in session. You plan to present your results by a 95%
confidence interval. Using the guessed value p* = 0.32,
find the sample size required if the interval is to have an
approximate margin of error of m = 0.04.

A college admissions director wishes to estimate the mean age of
all students currently enrolled. The age of a random sample of 23
students is given below. Assume the ages are approximately normally
distributed. Use Excel to construct a 90% confidence interval for
the population mean age. Round your answers to two decimal places
and use increasing order.
Age
25.8
22.2
22.5
22.8
24.6
24.0
22.6
23.6
22.8
23.1
21.5
21.4
22.5
24.5
21.5
22.5
20.5
23.0
25.1
25.2
23.8...

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...

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