# Confidence Intervals and Sample Sizes, assignment help

Question description

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.

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 #1:
Use the normal probability stat
file to calculate this problem.  Use
the first sheet at the bottom that says
Normal.  You should be able to get
all answers from that sheet.  Copy and
paste the output chart with answers.  Do
not worry about calculating the “real truth” as instructions
requested.  I am only looking for the
answers from the file on this one.
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 #2:
Use the Confidence Interval stat
file to calculate this problem.  Use
the second sheet on the bottom which
allows you to copy and paste your raw data into the file for it to
calculate.  Copy and paste the output
chart as well as the bell curve that is underneath the output chart that is the
normal prob chart for which the instructions are asking.
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.
Complete Problem #3:
Use the Confidence Interval stat
file, the sheet at the bottom for proportion
(sheet 3).  You can’t copy and paste raw
data here.  You must count the number of
successes by sorting the student data file by major and counting the # of
Finance majors.  Copy and paste the
relative charts here as you did in #2.
provided the files needed, let me know if you have troubles opening sheets.

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