Question
In: Statistics and Probability
a) A university planner wants to determine the proportion of spring semester students who will attend...
a) A university planner wants to determine the proportion of spring semester students who will attend summer school. She surveys 40 current students discovering that 15 will return for summer school.At 90% confidence, compute the margin of error for the estimation of this proportion.
b) A university planner wants to determine the proportion of spring semester students who will attend summer school. She surveys 36 current students discovering that 16 will return for summer school.At 90% confidence, compute the lower bound of the interval estimate for this proportion.
c) A university planner wants to determine the proportion of spring semester students who will attend summer school. Suppose the university would like a 0.90 probability that the sample proportion is within 0.101 or less of the population proportion.What is the smallest sample size to meet the required precision? (There is no estimation for the sample proportion.) (Enter an integer number.)
Solutions
orchestra answered 2 years agoRelated Solutions
a)A university planner wants to determine the proportion of spring semester students who will attend summer...
a)A university planner wants to determine the proportion of
spring semester students who will attend summer school. Suppose the
university would like a 0.90 probability that the sample proportion
is within 0.281 or less of the population proportion.What is the
smallest sample size to meet the required precision? (There is
no estimation for the sample
proportion.) (Enter an integer number.)
b)A university planner wants to determine the proportion of fall
semester students who will attend summer school. She surveys 30
current...
A university planner is interested in determining the percentage of spring semester students who will attend...
A university planner is interested in determining the
percentage of spring semester students who will attend summer
school. She takes a pilot sample of 160 spring semester students
discovering that 56 will return to summer school.
Construct a 90% confidence interval estimate for the percentage
of spring semester students who will return to summer school.
Construct a 95% confidence interval estimate for the percentage
of spring semester students who will return to summer school.
Question 1: A student at a university wants to determine if the proportion of students that...
Question 1: A student at a university wants to
determine if the proportion of students that use iPhones is less
than 0.34. If the student conducts a hypothesis test, what will the
null and alternative hypotheses be?
1)
HO: p < 0.34
HA: p ? 0.34
2)
HO: p > 0.34
HA: p ? 0.34
3)
HO: p = 0.34
HA: p ? 0.34
4)
HO: p ? 0.34
HA: p < 0.34
5)
HO: p ? 0.34
HA: p...
Saved A student at a university wants to determine if the proportion of students that use...
Saved
A student at a university wants to determine if the proportion
of students that use iPhones is greater than 0.4. The hypotheses
for this scenario are as follows. Null Hypothesis: p ≤ 0.4,
Alternative Hypothesis: p > 0.4. If the student randomly samples
27 other students and finds that 12 of them use iPhones, what is
the test statistic and p-value?
Question 7 options:
1)
Test Statistic: -0.471, P-Value: 0.319
2)
Test Statistic: -0.471, P-Value: 0.681
3)
Test Statistic:...
A researcher wants to know the proportion of students at the university who live in residence....
A researcher wants to know the proportion of students at the
university who live in residence. A sample of 50 students was taken
and the researcher found 25 of them lived in residence. What is the
99% confidence interval for the proportion of students who live in
residence?
1. A university wants to estimate the proportion of its students who smoke regularly. Suppose that...
1. A university wants to estimate the proportion of its students
who smoke regularly. Suppose that this university has N = 30, 000
students in total and a SRSWOR of size n will be taken from the
population. a) If the university wants the proportion estimator ˆp
to achieve the precision with tolerance level e = 0.03 and risk α =
0.1. Estimate the minimal sample size needed for this estimation.
(z0.1 = 1.28, z0.05 = 1.65) b) Suppose that,...
A researcher wants to determine whether high school students who attend an SAT preparation course score...
A researcher wants to determine whether high school students who
attend an SAT preparation course score significantly different on
the SAT than students who do not attend the preparation course. For
those who do not attend the course, the population mean is 1050 (μ
= 1050). The 16 students who attend the preparation course average
1150 on the SAT, with a sample standard deviationof 300. On the
basis of these data, can the researcher conclude that the
preparation course has...
A researcher wants to determine whether high school students who attend an SAT preparation course score...
A researcher wants to determine whether high school students who
attend an SAT preparation course score significantly different on
the SAT than students who do not attend the preparation course. For
those who do not attend the course, the population mean is 1050 (μ
= 1050). The 16 students who attend the preparation course average
1150 on the SAT, with a sample standard deviationof 300. On the
basis of these data, can the researcher conclude that the
preparation course has...
A researcher wants to determine whether high school students who attend an SAT preparation course score...
A researcher wants to determine whether high school students who
attend an SAT preparation course score significantly different on
the SAT than students who do not attend the preparation course. For
those who do not attend the course, the population mean is 1050 (μ
= 1050). The 16 students who attend the preparation course average
1150 on the SAT, with a sample standard deviation of 300. On the
basis of these data, can the researcher conclude that the
preparation course...
Researchers are comparing the proportion of University Park students who are Pennsylvania residents to the proportion...
Researchers are comparing the proportion of University
Park students who are Pennsylvania residents to the proportion of
World Campus students who are Pennsylvania residents. Data from a
sample are presented in the contingency table below.
Primary Campus
Total
University Park
World Campus
Pennsylvania Resident
Yes
115
70
185
No
86
104
190
Total
201
174
375
Construct a 95% confidence interval to estimate the
difference between the proportion of all University Park students
who are Pennsylvania residents and the proportion...
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