Question
1.
y-hat = 14 + 7.34x
y-hat = 3 + 25 In(x)
In(y-hat) = 2 + 0.08x; se = 0.06
In(y-hat) = 2.5 + 0.48 In(x); se = 0.16
a.
Interpret the slope coefficient in each of the above estimated models, when x increase by one unit in Models 1 and 3 and by 1% in Models 2 and 4.
(Round your answers to 2 decimal places.)
Model 1: y-hat increases by units.
7.34
Model 2: y-hat increases by about units. 0.25
Model 3: y-hat increases by about percent. 8.00
Model 4: y-hat increases by about percent. .48
2.
b.
For each model, what is the predicted change in y when x increases by 6%, from 10 to 10.6?
(Round intermediate calculations to 4 decimal places and final answers to 2 decimal
places.)
Model 1: y-hat increases by units.
4.40
Model 2: y-hat increases by units. 1.46
Model 3: y-hat increases by percent. 4.92
Model 4: y-hat increases by percent. 2.84
3. Consider the sample regressions for the linear, the logarithmic, the
exponential, and the log-log models. For each of the estimated models,
predict y when x equals 57. (Do not round intermediate calculations.
Round your answers to 2 decimal places.)
Response Variable: Response
y
Variable: ln(y)
Model 1
Model 2
Model 3
Model 4
Intercept
15.13
5.51
1.22
0.83
X
1.42
NA
0.05
NA
ln(x)
NA
24.45
NA
0.77
se
19.54
16.10
0.12
0.10
y-hat
Model 1
Model 2
Model 3
Model 4
4. Eva, the owner of Eva’s Second Time Around Wedding Dresses, currently has five dresses to be altered, shown in the order in which they arrived:
If Eva uses the shortest processing time first priority rule to schedule these jobs, what will be the average job tardiness?
2 hours
5. Eva, the owner of Eva’s Second Time Around Wedding Dresses, currently has five dresses to be altered, shown in the order in which they arrived:
If Eva uses the shortest processing time first (SPT) priority rule to schedule these jobs, what will be the average completion time?
3 hours
5 hours
7 hours