rom these data that brown-eyedstudents appear more trustworthy compared to theirblue-eyed counterparts? Test the hypothesis thatthe average scores for the two groups are the same.(Software gives k= 77.3.)7.44 Facebook use in college. Because of Facebook'spopularity among college students, there is a greatdeal of interest in the relationship between Facebookuse and academic performance. One study collected-information on n=at the relationships among frequency of Facebook use,participation in Facebook activities, time spent preparingfor class, and overall GPA.4Students reported preparing for class an average of706 minutes per week, with a standard deviation of526 minutes. Students also reported spending an averageof 106 minutes per day on Facebook, with a standarddeviation of 93 minutes; 8% of the students reportedspending no time on Facebook.1839 undergraduate students to look(a) Construct a 95% confidence interval for the averagenumber of minutes per week a student prepares for class.(b) Construct a 95% confidence interval for the averagenumber of minutes per week a student spends onFacebook. (Hint: Be sure to convert from minutes per dayto minutes per week.)(c) Explain why you might expect the populationdistributions of these two variables to be highlyskewed to the right. Do you think this fact makes yourconfidence intervals invalid? Explain your answer.7.45 Possible hiases? Refer to the previous exercise.

Confidence interval: Since the population standard deviation is unknown, t distribution can be used…

Answered: (a) Construct a 95% confidence interval…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Similar questions

What is a confidence interval and how do we calculate it?
The Pizza Shop wanted to determine what of its customers ordered an only cheese pizza. Out of 90 customers surveyed, 20 ordered only cheese Pizza. What is the 90% confidence interval of the true proportion of customers who order only cheese Pizza?
Describe three important properties of confidence intervals.
Suppose the English department of a local university has a total of 105 faculty members. Of this number, 24 (about 23%) are part-time instructors. Is it appropriate to find a confidence interval for the percentage of part-time instructors in the department? Find a 95% confidence interval or explain why you should not find a confidence interval for the percentage of part-time instructors in the English department.
.Jonida Martinez, researcher for the Columbian Coffee Corporation, is interested in Determining the rate of coffee usage per household in the United States. She believes that yearly consumption per household is normally distributed with an unknown mean µ and a standard deviation of about 1.25 pounds. If Martinez takes a sample of 36 households and records their consumption of coffee for one year, what is probability that the sample mean with in one half pound of the population mean? How large a sample must she take in order to be 98 percent certain that the sample mean is within one-half pound of the population mean?
Several years ago, 44% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,075 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,075 surveyed, 479 indicated that they were satisfied. Construct a 95% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed. What are the null and alternative hypotheses? Ho: p = 0.44 versus H,: p 0.44 (Round to two decimal places as needed.) Use technology to find the 95% confidence interval. The lower is The upper bound is (Round to two decimal places as needed.)
Several years ago, 45% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,025 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,025 surveyed, 484 indicated that they were satisfied. Construct a 99% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed.
The Pizza Shop wanted to determine what proportion of its customers ordered only cheese pizza. Out of 80 customers surveyed, 15 ordered cheese pizza. They want a 99% confidence interval of the true proportion of customers who order only cheese pizza. What is the 99% confidence interval of the true proportion of customers who order only cheese pizza? (0.075, 0.300) (0.115, 0.260) (0.086, 0.289) (0.102, 0.273)
Suppose NBC has asked the same question to a sample of 1296 adults nine months earlier, finding 47% with an optimistic outlook for the year ahead. Develop a 95% confidence interval for the percentage of American adults who had an optimistic outlook for the economy nine months earlier.
Can you help me with this question from my Business Statistics class?
According to a Field Poll, 263 out of 569 of California adults feel that "education and our schools" is one of the top issues facing California. We wish to construct a 90% confidence interval for the true proportion of California adults who feel that education and the schools is one of the top issues facing California. The error bound is ___________ rounded to 4 decimal places.

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