# Project #38974 - Statistics=Confidence Intervals

Discussion initial question & Response

**The initial response should be at least 100 words. In addition, you should also reply to any questions classmates may have about your own post. The replies to classmates should be at least 50 words each and should be direct replies to classmates’ initial posts.

Discussion question #1.

Choose a single variable from your own organization or another organization in which you are interested.  Describe how calculating a confidence interval from the results of a sample might be useful for learning more about the population statistics for that variable.  Indicate whether you would be calculating the confidence interval for a mean (interval or ratio variables) or for a proportion (nominal or ordinal variables).  Describe the sample you would take (how large would it be? how would it be selected?).  Include the name of the variable you have chosen in the title in the subject line of your post.

Focus on application in the replies to your classmates and indicate how your organization might use the type of data and/or sampling methods your classmates are describing.

Classmate Response 1A.

I am interested in finding out the percentage of special needs children that graduate high school having learned a skilled that they will use following graduation that allows them to obtain a job.

A confidence interval will allow us to gather a statistic that will be relatively close to a national account without the work it would take to obtain that information.

The calculations would be taken from five high schools randomly across the United States from the last five years of graduating students.  This makes these figures a confidence interval for a proportion because the facts won’t vary based on the particular interview of the specific people.

The variable chosen would be the nominal variable.  This offers a basic analysis of if a special needs student graduated with a task that they would be able to use following high school.  Percentages would also be a simple function to gather.

Classmate 1B= ? Not yet posted,will come back later with a classmate post.

*****************************************************************************

Assignment

Use the Student_Data.xls file which consists of 200 MBA students at Whatsamattu U. The file includes variables regarding students’ age, gender, major, GPA, Bachelors GPA, course load, English speaking status, family, weekly hours spent studying. Each of the three assigned problems should be formatted as a one page memo. Answers to all three of the problems should be submitted via the Drop Box as a single Word document with each of the problems clearly labeled. Be sure to include your name on the document itself!

COMPLETE PROBLEM 1: Let’s assume (for this problem only) that the Student_Data.xls file was the entire population. We know the mean and standard deviation of student ages to be 42.3 and 8.9, respectively. Using the Normal_ Probability.xls file:

a) compute the percentage of students that are older than 50,
b) compute the percentage of students that are younger than 40,
c) compute the percentage of students that are between 41 and 46, inclusive.
d) compute the age range of the oldest 10% of the students.

Then compare each of the answers you computed to the truth as found in the actual file. Briefly discuss your results (100+ words, 3 or more sentences).

COMPLETE PROBLEM 2: You wish to know the average GPA of MBA students at Whatsamatta U. Compute the 95% confidence interval of the mean using the sample of 200 students. Report on your findings (50+ words, 2 or more sentences) along with a normal probability chart that illustrates the points raised in your report.

COMPLETE PROBLEM 3: You wish to know the proportion of MBA students that are majoring in Finance. Compute the 95% confidence interval of the proportion using the sample of 200 students. Report on your findings (50+ words, 2 or more sentences) along with a normal probability chart that illustrates the points raised in your report.

 Subject Mathematics Due By (Pacific Time) 09/03/2014 03:30 pm
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