Professor Hall wants to estimate what the average GPA will be for the students in his...
Professor Hall wants to estimate what the average GPA will be for the students in his marketing research class this semester with 99% confidence and acceptable error of ±2%. Based on last semester’s GPA’s, he knows the variability in GPA is about 0.3 points. Calculate the sample size needed.
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Professor Hall wants to estimate what the average GPA will be
for the students in his...
A professor at a university wants to estimate the average number of hours of sleep students...
A professor at a university wants to estimate the average number of hours of sleep students get during exam week. On the first day of exams, she asked 27 students how many hours they had slept the night before. The average of the sample was 3.79 with a standard deviation of 1.224. When estimating the average amount of sleep with a 99% confidence interval, what is the margin of error? 1) 0.3549 2) 0.6546 3) 0.5839 4) 0.2356 5) 0.6527
Determine the sample size needed to construct a 99% confidence interval to estimate the average GPA...
Determine the sample size needed to construct a 99% confidence interval to estimate the average GPA for the student population at a college with a margin of error equal to 0.7. Assume the standard deviation of the GPA for the student population is 1.0 The sample size needed is _____
Determine the sample size needed to construct a 99% confidence interval to estimate the average GPA...
Determine the sample size needed to construct a 99% confidence interval to estimate the average GPA for the student population at a college with a margin of error equal to 0.4. Assume the standard deviation of the GPA for the student population is 3.0. The sample size needed is (Round up to the nearest integer.)
The professor suspects that her sample is flawed. She assigns each of the students in the...
The professor suspects that her sample is flawed. She assigns each of the students in the class an ID number from 1 to 62 and uses Excel to select a simple random sample of ID numbers. The professor meets with the students in the sample. Each student signs a release that gives the registrar permission to use the student’s GPA to compute the sample average. The professor assures the students that the registrar will provide her with the average and...
Determine the sample size needed to construct a 95% confidence interval to estimate the average GPA...
Determine the sample size needed to construct a 95% confidence interval to estimate the average GPA for the student population at a college with a margin of error equal to 0.2. Assume the standard deviation of the GPA for the student population is 25 The sample size needed is (Round up to the nearest integer.) Determine the sample size n needed to construct a 90% confidence interval to estimate the population proportion for the following sample proportions when the margin...
Professor Francis has implemented a new book for his Fall 2013 statistics course. He wants to...
Professor Francis has implemented a new book for his Fall 2013 statistics course. He wants to see if the new book has an effect on the exam average for Exam 3. He knows that the Exam 3 mean for all students who have taken his statistic course over the past 10 years is 77.2. He collects some data from a sample of 9 students and finds that the Exam 3 mean for his Fall 2013 statistics students is 81.7 with...
ASAP HELP!! A History professor at a local community college wants to estimate the percent of...
ASAP HELP!!
A History professor at a local community college wants to estimate the percent of college students that cheat on online assessment. Out of 100 college students sampled, 39 had cheated. Based on this, construct a 99% confidence interval for the proportion p of college students that have cheated in his history class. Make sure to express your answers as decimals, to three places. Use the point estimate and margin of error to express the same answer. Give your...
4. The department of HR at the University of Michigan wants to estimate the amount of...
4. The department of HR at the University of Michigan wants to estimate the amount of an annual healthcare premium needed for an Assistant Professor as part of a new recruiting program. In a sample of 50 Assistant Professors, they found that the average yearly premium needed is $16,000 with a standard deviation of $3,500. (a) What is the population mean? What is the best estimate of the population mean? (b) Develop an 90% confidence interval for the population mean....
A statistics professor classifies his students according to their grade point average (GPA) and their class...
A statistics professor classifies his students according to their grade point average (GPA) and their class rank. GPA is on a 0.0 - 4.0 scale and class rank is defined as the under" dass (freshmen and sophomores) and the upper class (Juniors and seniors). One student is selected at random GPA Class Under 2.0 2.0 - 3.0 Upper 0.117 0.207 Under 0.338 0.090 Given the student selected is in the "Under" class, what is the probability that her GPA is...
Alatistics professor classifies his students according to their grade point average (GPA) and their class rank....
Alatistics professor classifies his students according to their grade point average (GPA) and their class rank. GPA is on a 0.0-4.0 scale and class rank is defined as the under class of eshmen and sophomorest and the upper class unitors and seniors One student is selected at random Class Upper Under Under 2.0 0.117 0.338 GPA 20.30 0207 0.000 Over 10 0.145 0.103 What is the probability that the student is in the upper class and has GPA under 2.0?...
Determine the sample size needed to construct a 99% confidence interval to estimate the average GPA for the student population at a college with a margin of error equal to 0.4. Assume the standard deviation of the GPA for the student population is 3.0. The sample size needed is (Round up to the nearest integer.)
Determine the sample size needed to construct a 95% confidence interval to estimate the average GPA for the student population at a college with a margin of error equal to 0.2. Assume the standard deviation of the GPA for the student population is 25 The sample size needed is (Round up to the nearest integer.) Determine the sample size n needed to construct a 90% confidence interval to estimate the population proportion for the following sample proportions when the margin...
ASAP HELP!!
A History professor at a local community college wants to estimate the percent of college students that cheat on online assessment. Out of 100 college students sampled, 39 had cheated. Based on this, construct a 99% confidence interval for the proportion p of college students that have cheated in his history class. Make sure to express your answers as decimals, to three places. Use the point estimate and margin of error to express the same answer. Give your...
A statistics professor classifies his students according to their grade point average (GPA) and their class rank. GPA is on a 0.0 - 4.0 scale and class rank is defined as the under" dass (freshmen and sophomores) and the upper class (Juniors and seniors). One student is selected at random GPA Class Under 2.0 2.0 - 3.0 Upper 0.117 0.207 Under 0.338 0.090 Given the student selected is in the "Under" class, what is the probability that her GPA is...
Alatistics professor classifies his students according to their grade point average (GPA) and their class rank. GPA is on a 0.0-4.0 scale and class rank is defined as the under class of eshmen and sophomorest and the upper class unitors and seniors One student is selected at random Class Upper Under Under 2.0 0.117 0.338 GPA 20.30 0207 0.000 Over 10 0.145 0.103 What is the probability that the student is in the upper class and has GPA under 2.0?...
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