Question

The values of 2 variables x and y are given as below.

x 150 120 130 125 140 110 125 160

y 90 66 70 95 82 90 100 88

The linear correlation coefficient between x and y is

Select one:

a. 0.090

b. -0.247

c. 0.247

d. -0.090

e. None of the other answers in necessary true.

Answer #1

The data below represents height in inches/weight in pounds.
Clearly identify the dependent and independent variables as well as
the domain and range. Choose any two points from the data using
different independent variables and use those two points to
determine the rate of change (slope). Then, using the dependent
data value of -500 as your initial value, write an equation for the
linear function model. Predict what you expect at a height of
75".
inches/pounds
60" - 105, 110...

The data shown below for the dependent variable, y, and the
independent variable, x, have been collected using simple random
sampling.
X
11
14
10
15
14
10
13
12
y
110
130
100
140
150
120
110
130
Which graph below shows a scatter plot for this data?
What is the sign of the correlation coefficient?

Given the data below for the oil market, show a supply and
demand diagram, determine the linear equations for demand and for
supply, and find the equilibrium price and quantity in the market.
Find both sets of equations for Q = f(P), and P = f(Q).
QD
P
QS
83
60
80
82
70
82
81
80
83
80
90
83
79
100
84
78
110
85
77
120
86
76
130
86
76
140
87
75
150
88
Would...

Given below is a bivariate distribution for the random variables
x and y.
f(x,
y)
x
y
0.1
90
90
0.5
30
40
0.4
50
70
a. Compute the expected value and the variance
for x and y.
E(x)
=
E(y)
=
Var(x)
=
Var(y)
=
b. Develop a probability distribution for
x + y. Round your answers to one decimal
place.
x + y
f(x + y)
180
70
120
c. Using the result of part (b), compute
E(x...

The values given below shows the aptitude test scores,
x, and the intelligence quotient (IQ), y, for 9 people. Find the
correlation coefficient using Pearson Product and interpret your
result. (15 pts )
x : 68, 72, 65, 70, 62, 75, 78, 64, 69
y : 90, 85, 88, 100, 105, 98, 70, 65, 72

find the equation of the regression line for the given data.
x
y
430
150
480
170
320
130
380
120
290
70
530
180
Predict the value of
Y for x=180
x=100
x=140
x=210

Given below is a bivariate distribution for the random variables
x and y
f(x,y)
x
y
0.3
80
70
0.4
30
50
0.3
50
60
a. Compute the expected value and the variance
for x and y
E(x)=
E(y)=
Var(x)=
Var(y)=
b. Develop a probability distribution for
x+y
x+y
f(x+y)
150
80
110
c. Using the result of part (b), compute E(x+y)
and Var(x+y) .
E(x+y)
Var(x+y)
d. Compute the covariance and correlation for x
and y. If required, round...

A data set is provided, entitled oldfaithful_asst, on the
duration and height of the Old
Faithful geyser in the Yellowstone National Park.
a.
Construct a scatterplot using Excel or any software (SPSS or
Minitab)
between the variables “duration” and “height.” Please title the
graph
“Scatterplot 1 Old Faithful” and create labels for both
axes.
b.
There seems to be a an outlier in the data set. Although an
outlier is not a
detriment to the data analysis, as part of...

The dataset below contains two variables (X and Y). Please
estimate the following regression model:
Y = a + bX
Which of the coefficients (a and b in the equation above) are
(is) statistically significant at 90% or higher confidence
level?
Y
X
161
46
205
63
301
97
115
30
251
81
89
25
290
94
159
52
46
21
259
88
212
64
301
98
174
54
149
42
130
42
249
79
297
95
229
66
109...

given the following table compute the linear model
height (inches)
weight (pounds)
60
110
62
120
64
115
66
155
69
160
What are the following values?
correlation coefficient
b
m
what is the model?
if the height =67 what is the weight?

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