Complete "Practice Exercise 1" (page 157) and "Practice Exercise 11" (page 180) in the textbook. For the data set listed, use Excel to extract the mean and standard deviation for the sample of lengths of stay for cardiac patients. Use the following Excel steps:
1) Enter the data set into Excel.
2) Click on the Data tab at the top.
3) Highlight your data set with your mouse.
4) Click on the Data Analysis tab at the top right.
5) Click on Descriptive Statistics in the analysis tool list.
6) Find the mean and standard deviation of the data sets.
7) Send the results to instructor via e-mail, along with your analysis of the description of the data set.
APA format is not required, but solid academic writing is expected.
This assignment uses a grading rubric. Instructors will be using the rubric to grade the assignment; therefore, students should review the rubric prior to beginning the assignment to become familiar with the assignment criteria and expectations for successful completion of the assignment.
Exercises
156 Chapter 6: Inferences Concerning the MeanR,O
1. To estimate the time required to
provide a given laboratory procedure,
suppose that we measured
the amount of time required
when the service was provided
on 60 occasions. Based on this
sample, we obtained a mean of
20.32 minutes and a standard deviation
of 3.82 minutes.What
can we say with a probability of
0.95 about the size of the error
when we use 20.32 minutes as an
estimate of the true average time
required to provide the procedure?
(Hint:
–
X _ _ _ Z_/2
[S/√_n])
2. Use the data in Exercise 1 to construct
a 98% confidence interval.
11. Suppose that the medical staff indicates
that the results of a given
laboratory procedure must be
available 30 minutes after the
physician submits a request for
the service. In this situation, if
the results arrived 30 minutes or
less after the request, we regard
the performance of the laboratory
as timely. If results arrived
more than 30 minutes after the
request, we regard the performance
as tardy. Focusing on the
day, evening, and night shifts,
suppose that we selected a random
sample and obtained the
following results:
Shift
Performance Day Evening Night
Timely 100 80 40
Tardy 20 30 40
If _ _ 0.05, use these results to
test the proposition that the performance
of the laboratory is independent
of shift.