Question

Salt-free diets are often prescribed to people with high blood pressure. The following data were obtained from an experiment designed to estimate the reduction in diastolic blood pressure as a result of following a salt-free diet for two weeks. Assume diastolic readings to be normally distributed.

Before 93 106 87 92 102 95 88 110

After 92 102 89 92 101 96 88 105

Find the 98% confidence interval for the mean reduction. I need to find the answer using a TI84 calculator. Thanks.

Answer #1

1. Salt-free diets are often prescribed to people with high
blood pressure. The following data represents the diastolic blood
pressure of eight patients before implementing the diet and after
they had followed a salt-free diet for two weeks.
Before 93 106 87 92 102 95 88 110
After 92 102 89 92 101 96 88 105
What would you conclude about the implementation of a salt-free
diet based on this data?

Salt-free diets are often prescribed to people with high blood
pressure. Eight volunteers participated in a study. Data was
obtained from the experiment which was designed to estimate the
reduction in diastolic blood pressure as a result of following a
salt-free diet for two weeks. Assume diastolic readings are
normally distributed. The resulting mean difference is
1.25mmHg with a standard deviation of
2.4928mmHg. Construct a 98% confidence interval for the
mean reduction in the diastolic reading after two weeks on this
diet....

The efficacy of salt-free diets for controlling high blood
pressure is studied for a sample of 8 patients.
Each has their diastolic blood pressure measured before going on
the diet and after. The data appear below:
patient: 1 2 3 4 5 6 7 8
sample 1- Before: 93 106 90 93 102 95 88 110
sample 2- After: 92 102 89 92 101 96 87 105
Assume the differences in blood pressure fit a normal
distribution.
Use the matched pairs...

A physician claims that a person's diastolic blood pressure can
be lowered if, instead of taking a drug, the person meditates each
evening. Ten subjects are randomly selected and pretested. Their
blood pressures, measured in millimeters of mercury, are listed
below. The 10 patients are instructed in basic meditation and told
to practice it each evening for one month. At the end of the month,
their blood pressures are taken again. The data are listed below.
Test the physician's claim....

A physician claims that a person's diastolic blood pressure can
be lowered if, instead of taking a drug, the person meditates each
evening. Ten subjects are randomly selected and pretested. Their
blood pressures, measured in millimeters of mercury, are listed
below. The 10 patients are instructed in basic meditation and told
to practice it each evening for one month. At the end of the month,
their blood pressures are taken again. The data are listed below.
Test the physician's claim....

1. The following resting data were collected from three
different sports teams (hockey, rugby and football). Ignoring the
sport played, run a Kolmogorov–Smirnov test on the age variable.
What is the correct expression for the result?
ID
Sport
Age (y)
Body mass (kg)
Stature (m)
Resting heart rate (bpm)
Resting systolic blood pressure (mmHg)
Resting diastolic blood pressure (mmHg)
Resting mean arterial pressure (mmHg)
1
Hockey
18
79
1.83
65
121
79
93
2
Hockey
20
79.9
1.78
50
127...

The data are not actual data, but are modeled after data
collected by Trautwein and Ammerman (2013) for a study on the
effects of cochlear implants (CI) on the language, speech, and
perception skills of 32 deaf children: 16 subjects with at least
one cochlear implant (CI) and 16 subjects (with hearing loss)
without an implant. (CI subjects were implanted at 13 or 14 months
of age. So, no subjects had CIs at the time of the first data
collection.)...

16. The following resting data were collected from three
different sports teams (hockey, rugby and football). Ignoring the
sport played, run a Kolmogorov–Smirnov test on the age variable.
What is the correct expression for the result?
ID
Sport
Age (y)
Body mass (kg)
Stature (m)
Resting heart rate (bpm)
Resting systolic blood pressure (mmHg)
Resting diastolic blood pressure (mmHg)
Resting mean arterial pressure (mmHg)
1
Hockey
18
79
1.83
65
121
79
93
2
Hockey
20
79.9
1.78
50
127...

Open Three Hospitals data. SETUP: It is
believed that the number of injuries recorded in hospital 1 is
different from the number of injuries recorded in hospital 2. Given
the data your job is to confirm or disprove this assertion.
10. What test/procedure did you perform? (4
points)
a. Regression
b. Two sided t-test
c. One sided t-test
d. Confidence Interval
11. What is the statistical interpretation? (4
points)
a. Average of data is inconsistent with the claim
b. P-value...

Many standard statistical methods that you will study in Part II
of this book are intended for use with distributions that are
symmetric and have no outliers. These methods start with the mean
and standard deviation, x and s. For example,
standard methods would typically be used for the IQ and GPA data
here data215.dat.
(a) Find x and s for the IQ data. (Round your
answers to two decimal places.)
s=
Here are the numbers
obs gpa iq gender...

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