Question
In: Statistics and Probability
Homework Chapter 10: Compute the correlation coefficient State the hypothesis test the hypothesis at a=0.05. Use...
Homework Chapter 10:
Compute the correlation coefficient
State the hypothesis
test the hypothesis at a=0.05. Use Table 1
Determine the regression line equation if r is significant
Summarize the results
Gestation x 105 285 151 238 112
Longevity y 5 15 8 41 10
Solutions
orchestra answered 2 years agoRelated Solutions
True or False? A hypothesis test is conducted at to test whether the population correlation coefficient...
True or False? A hypothesis test is conducted
at to test whether the population correlation coefficient is zero.
If the sample size is 25 and the sample correlation coefficient is
0.6, then the critical values of the student t that define the
upper and lower tail rejection areas are 2.069 and -2.069,
respectively.
Use the Spearman's rank correlation coefficient at the 0.05 CI to investigate the relation between two...
Use the Spearman's rank correlation coefficient at the 0.05 CI
to investigate the relation between two variables X and Y
below.
X
Y
97
0
93
0
90
1
86
1
82
0
177
4
171
1
155
3
142
1
141
1
60
4
55
1
29
0
26
0
20
0
12
0
133
1
126
0
125
4
123
1
119
1
117
2
Test to see if the population correlation coefficient is not equal to zero using significance of 0.05. What are your conclusions?
Consider the following
X:
4
7
2
6
6
Y:
6
9
5
5
7
Using XLS, calculate the correlation coefficient for this
sample. Test to see if the population correlation coefficient is
not equal to zero using significance of 0.05. What are your
conclusions?
2. Provide a test of the null hypothesis that the population correlation coefficient for X1-Y1 sample...
2. Provide a test of the null hypothesis that the population
correlation coefficient for X1-Y1 sample is zero against the
alternative hypothesis that it is not zero. Set alpha=0.01.
a. Test statisitc ==>
b. Test critical value ==>
c. Conclusion ==>
X1 and Y1 data are in the google doc
https://drive.google.com/file/d/1luXDuc_jl2CStByttmhZi3gZkiuwNzuG/view?usp=sharing
2. Provide a test of the null hypothesis that the population correlation coefficient for X1-Y1 sample...
2. Provide a test of the null hypothesis that the population
correlation coefficient for X1-Y1 sample is zero against the
alternative hypothesis that it is not zero. Set alpha=0.01.
a. Test statisitc ==>
b. Test critical value ==>
c. Conclusion ==>
3. Provide a test of the null hypothesis that the population
correlation coefficients for the X2-Y2 and X3-Y3 samples are equal
to one another versus the alternative hypothesis that the
population correlation for the X3-Y3 sample is larger. Set...
In conducting a hypothesis test for a correlation, the correct probability distribution to use is the...
In conducting a hypothesis test for a correlation, the correct
probability distribution to use is the F distribution.
True
False
Utah State University recently randomly sampled ten students and
analyzed grade point average (GPA) and number of hours worked
off-campus per week. The following data were observed:
GPA
HOURS
3.14
25
2.75
30
3.68
11
3.22
18
2.45
22
2.80
40
3.00
15
2.23
29
3.14
10
2.90
0
If the university wished to test the claim that the correlation...
For the following use the Spearman rank correlation coefficient to test the claim. The overall scores...
For the following use the Spearman rank correlation coefficient
to test the claim. The overall scores and the prices for 10
randomly selected computers. The score is based on overall quality
of the computer. At a .05 sig. can you conclude there is a
correlation between price and score? Utilize excel to show your
work.
Score
91
94
99
89
86
81
72
85
94
98
86
Price (in dollars)
1250
1500
1495
1150
1195
1685
989
1175
1350
1425...
Compute the sample correlation coefficient r for each of the following data sets. (Use 3 decimal...
Compute the sample correlation coefficient
r for each of the following data sets.
(Use 3 decimal places.)
(a)
x
5
8
9
y
2
2
5
(b)
x
2
2
5
y
5
8
9
r(a) =
r(b) =
x
2
1
2
4
3
y
5
10
9
15
10
(a) Find the linear correlation coefficient r.
Hypothesis test for correlation. Use the given data to do the following tasks.
Hypothesis test for correlation. Use the given data to do the following tasks.
x
y
5
20
6
20
7
15
8
16
9
11
10
11
(a) Calculate the correlation coefficient r. (use three sig figs)(b) Find the regression line: y=y= + xx. (round values to two decimal places)(d) Test the claim that there is correlation and find the p-value: (State answer to three significant figures, which is different than stating values to three decimal places. For our purposes, stating a value...
Use Problem #5 to test the hypothesis that there is no correlation between advertising and sales....
Use Problem #5 to test the hypothesis that there is no
correlation between advertising and sales. In rejecting this
hypothesis, you wish to be 80% confident. Hints: Tcalc and
Tcrit
From #5: r= -0.8490, n=5
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