MATLAB: An Introduction with Applications
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
 
 
 
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view the data obtained by the doctor.
 

obtained by the doctor is the in the data table below. Complete parts​ (a) through​ (f) below.
 
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Click the icon to view the data obtained by the doctor.
​(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?
 
 
A.
The relation appears to be nonlinear.
 
B.
There does not appear to be a relation.
Your answer is correct.
 
C.
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
Your answer is correct.
 
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?
 
 
A.
Upper H 0H0​:
beta 1β1equals=​0;
Upper H 1H1​:
beta 1β1greater than>0
 
B.
Upper H 0H0​:
beta 1β1equals=​0;
Upper H 1H1​:
beta 1β1less than<0
 
C.
Upper H 0H0​:
beta 1β1equals=​0;
Upper H 1H1​:
beta 1β1not equals≠0
Your answer is correct.
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?
 
 
A.
RejectReject
the null hypothesis because the​ P-value is
greatergreater
than
alphaαequals
 
B.
RejectReject
the null hypothesis because the​ P-value is
lessless
than
alphaαequals=
 
C.
Do not rejectDo not reject
the null hypothesis because the​ P-value is
lessless
than
alphaαequals=
 
D.
Do not rejectDo not reject
the null hypothesis because the​ P-value is
greatergreater
than
alphaαequals=0.010.01.
Your answer is correct.
​(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.
 
 
A.
​Yes, because the null hypothesis was rejected.
 
B.
​No, because the null hypothesis was rejected.
 
C.
​Yes, because the null hypothesis was not rejected.
 
D.
​No, because the null hypothesis was not rejected.
Your answer is correct.
A good estimate for the HDL cholesterol of this patient is
 
​(Round to two decimal places as​ needed.)
 
 

 

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