A claim is made that at least 10% of the students at the University are from...
A claim is made that at least 10% of the students at the University are from out-of-state. To test this, 80 students in a random sampling were asked whether they came from out-of-state with the result that says reported that they did. Try to disprove the claim at the point 0.05 level.
Homework Answers
Add Answer to:
A claim is made that at least 10% of the students at
the University are from...
A university has found over the years that out of all the students who are offered...
A university has found over the years that out of all the students who are offered admission, the proportion who accept is .60. After a new director of admissions is hired. the university wants to check if the proportion of students accepting has increased significantly. Suppose they offer admission to 1250 students and 823 accept. Is this 12. evidence at the a = 01 level that there has been a significant increase in proportion of students accepting admission? 13. A...
7. A survey of first-year and second-year students at a large university asked if students were satisfied with college life. We are interested in whether there is a difference between first and secon...
7. A survey of first-year and second-year students at a large university asked if students were satisfied with college life. We are interested in whether there is a difference between first and second-year students with respect to this question. You performed a hypothesis test and found there was no evidence of a difference between first and second-year students in response to this question. You based th on a test using alpha -0.01. Would you have made the same decision at...
Education officials in a particular state claim that their state is especially effective in preparing students...
Education officials in a particular state claim that their state
is especially effective in preparing students for college.
One
assessment of preparation for college is the mathematics part of
the Scholastic Aptitude Test (SAT-Math). Suppose that one
wanted to infer the population mean SAT-Math score for students in
this state using the mean of a simple random sample of
SAT-Math scores of students from this state, and one knew that the
population standard deviation σ = 100‡.
sample mean: 525...
Exercise 3. Suppose we would like to test the hypothesis that at least 10% of students...
Exercise 3. Suppose we would like to test the hypothesis that at least 10% of students suffer from allergies. We collect a random sample of 225 students and 21 of them suffer from allergies. (a) State the null and alternative hypotheses. (b) Obtain a test statistic and a p-value. (c) State the conclusion at the a = 0.05 level.
The average GPA score for students at a university was 3.75. Five years later, a professor...
The average GPA score for students at a university was 3.75. Five years later, a professor wants to perform a hypothesis test to determine whether the average GPA score of students at the university has changed. He picks a random sample of 50 students and obtains their mean GPA score, which is 3.10. The population standard deviation is known as 1.15. Test whether the claim that the average GPA score at the university has dropped from 3.75 is supported or...
The average GPA score for students at a university was 3.75. Five years later, a professor...
The average GPA score for students at a university was 3.75. Five years later, a professor wants to perform a hypothesis test to determine whether the average GPA score of students at the university has changed. He picks a random sample of 50 students and obtains their mean GPA score, which is 3.10. The population standard deviation is known as 1.15. Test whether the claim that the average GPA score at the university has dropped from 3.75 is supported or...
The president of a university claims that the mean time spent partying by all students at...
The president of a university claims that the mean time spent partying by all students at this university is not more than 7 hours per week. A random sample of 40 students taken from this university showed that they spent an average of 7.5 hours partying the previous week with a sample standard deviation of 2.3 hours. Use the p-value approach to test at a 5% significance level whether the president’s claim is true.
A university dean randomly selected 200 students and found that 102 of them were receiving financial...
A university dean randomly selected 200 students and found that 102 of them were receiving financial aid. a) Calculate the 80% confidence interval for the true rate of students who receive financial aid. Interpret the result. b) Calculate the 90% confidence interval for the true rate of students who do not receive financial aids. Interpret the result. c) How large a sample size needed with 95% confidence to estimate the true rate of students who receive financial aid within 0.05....
A book about different colleges' reports that the mean time students at a particular university study...
A book about different colleges' reports that the mean time students at a particular university study each week is 1015 minutes. A dean says she believes the mean is greater than 1015 minutes. To test her claim, she takes a random sample of 64 students and finds that the sample mean is 1050 minutes, with standard deviation 150 minutes 4. Show that this meets the requirements for a significance test for a mean. State the null hypothesis and the alternate...
The mean salary offered to students who are graduating from Coastal State University this year is...
The mean salary offered to students who are graduating from Coastal State University this year is $24,215, with a standard deviation of $3643. A random sample of 80 Coastal State students graduating this year has been selected. What is the probability that the mean salary offer for these 80 students is $24.250 or more? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places. OX
A university has found over the years that out of all the students who are offered admission, the proportion who accept is .60. After a new director of admissions is hired. the university wants to check if the proportion of students accepting has increased significantly. Suppose they offer admission to 1250 students and 823 accept. Is this 12. evidence at the a = 01 level that there has been a significant increase in proportion of students accepting admission? 13. A...
7. A survey of first-year and second-year students at a large university asked if students were satisfied with college life. We are interested in whether there is a difference between first and second-year students with respect to this question. You performed a hypothesis test and found there was no evidence of a difference between first and second-year students in response to this question. You based th on a test using alpha -0.01. Would you have made the same decision at...
Education officials in a particular state claim that their state
is especially effective in preparing students for college.
One
assessment of preparation for college is the mathematics part of
the Scholastic Aptitude Test (SAT-Math). Suppose that one
wanted to infer the population mean SAT-Math score for students in
this state using the mean of a simple random sample of
SAT-Math scores of students from this state, and one knew that the
population standard deviation σ = 100‡.
sample mean: 525...
Exercise 3. Suppose we would like to test the hypothesis that at least 10% of students suffer from allergies. We collect a random sample of 225 students and 21 of them suffer from allergies. (a) State the null and alternative hypotheses. (b) Obtain a test statistic and a p-value. (c) State the conclusion at the a = 0.05 level.
The average GPA score for students at a university was 3.75. Five years later, a professor wants to perform a hypothesis test to determine whether the average GPA score of students at the university has changed. He picks a random sample of 50 students and obtains their mean GPA score, which is 3.10. The population standard deviation is known as 1.15. Test whether the claim that the average GPA score at the university has dropped from 3.75 is supported or...
The average GPA score for students at a university was 3.75. Five years later, a professor wants to perform a hypothesis test to determine whether the average GPA score of students at the university has changed. He picks a random sample of 50 students and obtains their mean GPA score, which is 3.10. The population standard deviation is known as 1.15. Test whether the claim that the average GPA score at the university has dropped from 3.75 is supported or...
A book about different colleges' reports that the mean time students at a particular university study each week is 1015 minutes. A dean says she believes the mean is greater than 1015 minutes. To test her claim, she takes a random sample of 64 students and finds that the sample mean is 1050 minutes, with standard deviation 150 minutes 4. Show that this meets the requirements for a significance test for a mean. State the null hypothesis and the alternate...
The mean salary offered to students who are graduating from Coastal State University this year is $24,215, with a standard deviation of $3643. A random sample of 80 Coastal State students graduating this year has been selected. What is the probability that the mean salary offer for these 80 students is $24.250 or more? Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places. OX
Most questions answered within 3 hours.
-
Investors who find out what shares Warren Buffett, a famous
investor, is buying or selling to...
asked 3 minutes ago -
b) Compute the mean for all 5 Upper C 2 equals 10 samples with
size nequals2....
asked 10 minutes ago -
Giving a test to a group of students, the grades and gender are
summarized below A...
asked 13 minutes ago -
The ["VTP", "SNMP", "SMTP", "IPX"]
protocol is used by a collection of
switches...
asked 11 minutes ago -
MnO−4 reacts with
Fe2+ in acid solution to produce
Fe3+ and Mn2+. Write a balanced
equation...
asked 13 minutes ago -
Are some number of occupational illnesses and injuries an
acceptable part of doing business? Why or...
asked 36 minutes ago -
What is the Z score?
Use the following number to answer the question below:
X =...
asked 38 minutes ago -
The speed of the earth in its orbit is 29.8 km / s. Considering a displacement...
asked 42 minutes ago -
Find a source code of a program or developed software system.
You can select any source...
asked 41 minutes ago -
Suppose the events A and B have the property that P(B) = 0.5 and
P(A and...
asked 55 minutes ago -
Consider a C function negMat(), that negates each element of a K
x K matrix y[][],...
asked 52 minutes ago -
The random variable X is exponentially distributed, where X
represents the time it takes for a...
asked 56 minutes ago