Question

What is the average serum bilirubin level of patients admitted to a hospital for treatment of hepatitis? A sample of 10 patients yielded the following results: 20:5;14:8;21:3;12:7;15:2;26:6;23:4;22:9;15:7;19:2 Construct a 95 percent confidence interval for the population mean

Answer #1

A sample of 9 patients admitted to a hospital for treatment of
hepatitis yielded the serum bilirubin levels as follows: 20.5
,14.8, 21.3, 12.7, 15.2, 26.6, 23.4 ,22.9, 15.7 Construct a 95
percent confidence interval for the population mean. (assume normal
population)

An administrator for a hospital wished to estimate the average
number of days required for inpatient treatment of patients between
the ages of 25 and 34. A random sample of 500 hospital patients
between these ages produced a mean and standard deviation equal to
5.4 and 3.1 days, respectively. Assume that ages of patients are
normally distributed.
(a) Construct a 95% confidence interval for the mean length of
stay for the population of patients from which the sample was
drawn....

A psychologist is interested in the
effect of CBT in patients admitted to a psychiatric hospital for
schizophrenia. Below, these data were collected from 8 patients.
The scores are a sum of delusional thoughts before and after CBT;
lower scores indicate that less delusional thoughts were reported.
Using a 0.05 level of significance to test whether CBT was
successful as a treatment.
Patient
Pre CBT
Post CBT
1
31
24
2
29
25
3
22
20
4
26
25
5...

1. A survey of 30 emergency room patients found that the average
waiting time for treatment was 174.3 minutes. Assuming that the
population standard deviation is 46.5 minutes, find the best point
estimate of the population mean. Construct and interpret the 99%
confidence interval of the population mean.

A hospital checks the records of 340 randomly selected
patients from the previous year. the average length of the stay in
the hospital is 4.3 days with a standard deviation of 3.1
days.
A) Findthe 95%Confidence interval for the true mean and intrepet
it
B) Find the 99% Confidence interval for the true mean.
C)Compare the results of A and B and give reasons for any
differences
.
B) x

A study of 400 patients hospitalized with diabetes
mellitus-related complications shows that serum cholesterol level
is a normally distributed variable with a mean of 220 mg/dL and
standard deviation of 10 mg/dL. Based on the study results how many
patients do you expect to have serum cholesterol ≥ 240 mg/dL in
this study? a. 2 b. 10 c. 20 d. 64 e. 128

A hospital administrator wants to determine the proportion of
emergency room patients that use the emergency room (ER) for
non-emergency care. She randomly samples records from 350 ER
patients and determines that 74 of those patients required only
non-emergency care.
1. The administrator constructs a 90% confidence interval for
the true proportion of all ER patients who use the ER for
non-emergency care. The error bound for the proportion EBP for this
confidence interval is:
A. 0.036
B. 0.072
C....

It is known that the serum cholesterol level of females is
normally distributed and its population variance is 45 mg/100 ml.
Researchers decided to estimate the population mean serum
cholesterol level. They observed a sample average serum cholesterol
level of 220 mg/ml in 35 females. Researchers at another university
are going to collect new data and they are assuming that the female
serum cholesterol level is Normally distributed with population
variance of 45. How many subjects do they have to...

Nationally, patients who go to the emergency room wait an
average of 7 hours to be admitted into the hospital. Do patients at
rural hospitals have a lower waiting time? The 10 randomly selected
patients who went to the emergency room at rural hospitals waited
an average of 6.2 hours to be admitted into the hospital. The
standard deviation for these 10 patients was 2.5 hours. What can be
concluded at the the αα = 0.01 level of significance level...

Typically, elderly patients with hip fractures may have long
recovery times. At one hospital, the average amount of time that
elderly patients with hip fractures would spend in the hospital
before they could be released to home care was 15 days. A new
physiotherapy program is developed and researchers want to see if
this new program gives recovery times that are different than the
typical average amount. A random sample of 12 patients was enrolled
in the new program and...

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