Question

Historically, the proportion of students entering a university who finished in 4 years or less was 62%. To test whether this proportion has decreased, 120 students were examined and 48% had finished in 4 years or less. To determine whether the proportion of students who finish in 4 year or less has statistically significantly decreased (at the 5% level of signficance), what is the critical value? (please round your answer to 2 decimal places)

Answer #2

answered by: anonymous

The proportion of the college x students (the population)
graduating in 4 years or less is known to be 38%. If we take a
random sample of 100 students of college x, what is the probability
that the proportion of students who graduate in 4 years or less in
the sample is at least 40%,(?̂≥ 40/100 )=?

The office of records at a university has stated that the
proportion of incoming female students who major in business has
increased. A random sample of female students selected several
years ago is compared with a random sample of female students
selected this year. Results are summarized below. Has the
proportion increased significantly? Test at α = .10.
Sample Size
No. Majoring in Business
Previous sample
250
50
Present sample
300
69

A student at a university wants to determine if the proportion
of students that use iPhones is less than 0.33. The hypotheses for
this scenario are as follows. Null Hypothesis: p ≥ 0.33,
Alternative Hypothesis: p < 0.33. If the student takes a random
sample of students and calculates a p-value of 0.0466 based on the
data, what is the appropriate conclusion? Conclude at the 5% level
of significance.
1)
The proportion of students that use iPhones is greater than...

A university dean states that the proportion of students who
receive some sort of financial aid has increased compared to 55% of
students who received financial aid over the last several years.
The dean randomly selects 200 students and finds that 118 of them
are receiving aid.
Form the hypothesis to test the dean’s statement.
Conduct this test and explain if you support the dean’s
statement using 5% significance level for this test.

50% of students entering four-year colleges receive a degree
within six years. Is this percent larger than for students who play
intramural sports? 148 of the 269 students who played intramural
sports received a degree within six years. What can be concluded at
the level of significance of αα = 0.05?
For this study, we should use Select an answer z-test for a
population proportion t-test for a population mean
The null and alternative hypotheses would be:
Ho: ? μ...

55% of students entering four-year colleges receive a degree
within six years. Is this percent larger than for students who play
intramural sports? 170 of the 299 students who played intramural
sports received a degree within six years. What can be concluded at
the level of significance of α = 0.05?
a. For this study, we should use (t-test for a population mean,
z-test for population proportion)
b. The null and alternative hypotheses would be:
Ho: ( p, μ) (...

1. A university Dean is interested in determining the proportion
of students who receive
some sort of financial aid. Rather than examine the records for all
students, the dean randomly selects
200 students and finds that 118
of them are receiving financial aid. By hand, and using formulas
for the
“Margin of Error” (i.e. not calculator confidence interval), find a
98% confidence interval to estimate
the true proportion of students on financial aid. (Use 3 decimal
places for proportions.)
2....

32. Suppose a survey is conducted five years ago at a university
showed that there are 500 students out of all the 5000 students
would like to go graduate school after they obtained the bachelor’s
degree. This year a new survey was conducted on a random sample of
500 students from this university, and it was found that 80 of them
would like to go graduate school after they graduate. Do these data
provide convincing evidence to suggest that the...

In the past, 60% of all undergraduate students enrolled at State
University earned their degrees within four years of matriculation.
A random sample of 95 students from the class that matriculated in
the fall of 2014 was recently selected to test whether there has
been a change in the proportion of students who graduate within
four years. Administrators found that 40 of these 95 students
graduated in the spring of 2018 (i.e., four academic years after
matriculation).
Given the sample...

1. A psychology professor at a university is interested in
determining the proportion of undergraduate students at her
university who self-identify as early-risers, night-owls, or
neither. She decides to perform an observational study to
investigate this question, so she randomly selects 500
undergraduate students from a university with 11088 undergraduate
students enrolled to whom she poses her question. 274 respond that
they would call themselves night-owls, 124 replied that they are
early-risers, and 102 respond that they are neither. Is...

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