MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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A doctor wanted to determine whether there is a relation between a male's age and his HDL (so-called good) cholesterol. The doctor randomly selected 17 of his patients and determined their HDL cholesterol. The data obtained by the doctor is the in the data table below. Complete parts (a) through (f) below.
Age vs. HDL Cholesterol data
Age, x
|
HDL Cholesterol, y
|
Age, x
|
HDL Cholesterol, y
|
|
---|---|---|---|---|
3838
|
5555
|
4040
|
4343
|
|
4141
|
5454
|
6767
|
6464
|
|
4747
|
3535
|
2929
|
5353
|
|
3232
|
5656
|
5050
|
3737
|
|
5454
|
3434
|
2626
|
4444
|
|
5252
|
3939
|
5151
|
3636
|
|
6060
|
4444
|
4747
|
5353
|
|
6161
|
3838
|
4040
|
2828
|
|
2626
|
4949
|
|
|
|
PrintDone
obtained by the doctor is the in the data table below. Complete parts (a) through (f) below.
LOADING...
(a) Draw a scatter diagram of the data, treating age as the explanatory variable. What type of relation, if any, appears to exist between age and HDL cholesterol?
The relation appears to be nonlinear.
There does not appear to be a relation.
The relation appears to be linear.
(b) Determine the least-squares regression equation from the sample data.
ModifyingAbove y with caret equalsy=negative
(Round to three decimal places as needed.)
(c) Are there any outliers or influential observations?
No
Yes
(d) Assuming the residuals are normally distributed , test whether a linear relation exists between age and HDL cholesterol levels at the
alphaαequals
level of significance.What are the null and alternative hypotheses?
Upper H 0H0:
beta 1β1equals=0;
Upper H 1H1:
beta 1β1greater than>0
Upper H 0H0:
beta 1β1equals=0;
Upper H 1H1:
beta 1β1less than<0
Upper H 0H0:
beta 1β1equals=0;
Upper H 1H1:
beta 1β1not equals≠0
Use technology to compute the P-value. Use the Tech Help button for further assistance.
The P-value is
0.5700.570.
(Round to three decimal places as needed.)
What conclusion can be drawn at
alphaαequals=
level of significance?RejectReject
the null hypothesis because the P-value is
greatergreater
than
alphaαequals
RejectReject
the null hypothesis because the P-value is
lessless
than
alphaαequals=
Do not rejectDo not reject
the null hypothesis because the P-value is
lessless
than
alphaαequals=
Do not rejectDo not reject
the null hypothesis because the P-value is
greatergreater
than
alphaαequals=0.010.01.
(e) Assuming the residuals are normally distributed, construct a 95% confidence interval about the slope of the true least-squares regression line.
Lower Bound
|
equals=
|
negative 0.554−0.554
|
Upper Bound
|
equals=
|
0.3170.317
|
(Round to three decimal places as needed.)
(f) For a 42-year-old male patient who visits the doctor's office, would using the least-squares regression line obtained in part (b) to predict the HDL cholesterol of this patient be recommended?
If the null hypothesis was rejected, that means that this least-squares regression line can accurately predict the HDL cholesterol of a patient. If the null hypothesis was not rejected, that means the least-squares regression line cannot accurately predict the HDL cholesterol of a patient.
Should this least-squares regression line be used to predict the patient's HDL cholesterol? Choose the correct answer below.
Yes, because the null hypothesis was rejected.
No, because the null hypothesis was rejected.
Yes, because the null hypothesis was not rejected.
No, because the null hypothesis was not rejected.
A good estimate for the HDL cholesterol of this patient is
(Round to two decimal places as needed.)
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