Question
In: Math
Using the data in RDCHEM.RAW, the following equation was obtained by OLS: \ rdintens = 2.613...
Using the data in RDCHEM.RAW, the following equation was
obtained by OLS:
\ rdintens = 2.613 + .00030sales + .0000000070sales2
(.429) (.00014) (.0000000037)
n = 32, R2 = .1484
i) At what point does the marginal effect of sales on rdintens
become negative?
ii) Would you keep the quadratic term in the model? Explain.
1
iii) Define salesbil as sales measured in billions of dollars:
salesbil = sales 1,000. Rewrite the estimated equation with
salesbil and salesbil2 as the independent variables. Be sure to
report standard errors and the R-squared. [Hint: Note that
salesbil2 = sales2 (1,000)2 .]
iv) For the purpose of reporting the results, which equation do you
prefer?
Solutions
milcah answered 1 week agoRelated Solutions
the following equation was obtained by OLS: log(salary) = 4.32 + 0.310log(sales) + 0.0191roe + 0.00025ros...
the following equation was obtained by OLS:
log(salary) = 4.32 + 0.310log(sales) + 0.0191roe +
0.00025ros
(0.26) (0.031) (0.0049) (0.00056)
You can see the corresponding
(heteroskedasticity-robust/White) standard errors in parentheses
below the coefficients. In addition, you know from the output that
n = 210 and R2 = 0.291. By what percentage is salary predicted to
increase if ros increases by 50 percentage points? (Answer with a
whole interpretation sentence!) Does ros have a practically large
effect on salary? (To phrase...
A researcher obtained the ordinary least squares (OLS) estimates for a Ghanaian firm's stock price using...
A researcher obtained the ordinary least squares (OLS) estimates
for a Ghanaian firm's stock price using 120 observations from 1980
ml to 1989 m 12 (All variables in logarithms) as:
In St = 0.87 -054 In pt + 0.65 In
yt + 0.34 In rt - 0.32 In mt
Standard errors:
pt = (1.06)
yt = (0.24)
rt = (0.12)
mt = (0.24)
Adjusted R2=0.34, RSS = 1.24,
F1154 =3.75
St are the log of the stock price, pt is...
Using the data on 4137 college students, the following equation was estimated Using the data on...
Using the data on 4137 college students, the following equation
was estimated
Using the data on 4137 college students, the following equation
was estimated
by OLS
colgpai =β0 +β1hsperci +ui, i=1,2,...,4137
where colgpa is measured on a four-point scale and hsperc is the
percentile in the high school graduating class (defined so that,
for example, hsperc = 5 means the top 5 percent of the class).
Coefficients:
Estimate Std. Error t value Pr(>|t|) (Intercept) 2.9803872
0.0141800 210.2 <2e-16 *** hsperc...
Find the regression equation using the following set of data with y as the response variable....
Find the regression equation using the following set of data
with y as the response variable.
x
y
40.2
82.2
54.2
111.8
43
84.3
30.7
68.5
33
90.8
42.8
78.5
30.9
71.7
28.6
69.8
36.6
83.1
41.1
93.9
26.6
63.9
45.5
95.5
What is the correlation coefficient? use three decimal
places.
r =
What is the regression line equation. Use each value to three
decimal places.
ˆyy^ = + x
What is the predicted value of the response variable, when using a...
Question #1 - Using the data on 4137 college students, the following equation was estimated by...
Question #1 - Using the data on 4137 college students, the
following equation was estimated
by OLS
colgpai = β0 + β1 hsperci + ui
, i = 1, 2, . . . , 4137
where colgpa is measured on a four-point scale and hsperc is the
percentile in the
high school graduating class (defined so that, for example, hsperc
= 5 means the top
5 percent of the class).
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 2.9803872 0.0141800...
The following data were obtained in a study using three separate samples to compare three different...
The following data were obtained in a study using three separate
samples to compare three different treatments. Conduct an analysis
of variance with α=0.05α=0.05 to determine whether these data are
sufficient to conclude that there are significant differences
between the treatments.
Treatment A
Treatment B
Treatment C
6
4
11
8
6
9
7
6
9
7
4
7
F-ratio =
p-value =
Conclusion:
These data do not provide evidence of a difference between the
treatments
There is a significant...
The following data were obtained in a study using three separate samples to compare three different...
The following data were obtained in a study using three separate
samples to compare three different treatments. Conduct an analysis
of variance with α=0.05α=0.05 to determine whether these data are
sufficient to conclude that there are significant differences
between the treatments.
Treatment A
Treatment B
Treatment C
22
21
22
23
19
24
21
19
24
22
21
26
F-ratio =
p-value =
Conclusion:
There is a significant difference between treatments
These data do not provide evidence of a difference...
The following data were obtained in a study using three separate samples to compare three different...
The following data were obtained in a study using three separate
samples to compare three different treatments. Conduct an analysis
of variance with α=0.05α=0.05 to determine whether these data are
sufficient to conclude that there are significant differences
between the treatments.
Treatment A
Treatment B
Treatment C
14
10
13
13
12
15
12
12
17
13
10
15
F-ratio =
p-value =
Conclusion:
These data do not provide evidence of a difference between the
treatments
There is a significant...
The following data were obtained in a study using three separate samples to compare three different...
The following data were obtained in a study using three separate
samples to compare three different treatments. Conduct an analysis
of variance with α=0.05 to determine whether these data are
sufficient to conclude that there are significant differences
between the treatments.
Treatment A
Treatment B
Treatment C
9
5
12
8
7
10
7
7
10
8
5
8
F-ratio =____________________
p-value =__________________
Conclusion:
__These data do not provide evidence of a difference between
the treatments
__There is a significant...
The following data were obtained in a study using three separate samples to compare three different...
The following data were obtained in a study using three separate
samples to compare three different treatments.
Treatment 1
Treatment 2
Treatment 3
4
3
8
3
1
4
5
4
3
1
6
6
M = 4
M = 2
M = 6
SS = 2
SS = 4
SS = 8
a. State the null and alternative hypotheses.
b. Fill in the ANOVA table below.
Source
SS
df
MS
F
Between treatments
Within treatments
Total
c. If α...
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