Student Solutions Manual for Devore's Probability and Statistics for Engineering and the Sciences, 9th
9th Edition
ISBN: 9798214004020
Author: Jay L. Devore
Publisher: Cengage Learning US
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Textbook Question
Chapter 4, Problem 115SE
Let Ii be the input current to a transistor and I0 be the output current. Then the current gain is proportional to ln(I0/Ii). Suppose the constant of proportionality is 1(which amounts to choosing a particular unit of measurement),so that current gain = X = ln(I0/Ii). Assume X is
a. What type of distribution does the ratio I0/Ii have?
b. What is the
c. What are the
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Let F(tl=teti+.
+ tEk. Find SFtldt
%3D
The efficiency for a steel specimen immersed in a phosphating tank is the weight of the phosphate coating divided by the metal loss (both in mg/ft). An article gave the accompanying data on tank temperature (x) and efficiency ratio (y).
Temp.
171
173
174
175
175
176
177
178
Ratio
0.86
1.29
1.40
1.05
1.01
1.04
0.94
1.78
Temp.
181
181
181
181
181
182
182
183
Ratio
1.41
1.56
1.63
2.03
2.07
0.76
1.47
0.84
Temp.
183
183
183
185
185
186
187
189
Ratio
1.75
1.92
2.64
1.39
2.58
2.90
1.81
3.16
In USE SALT
(a) Determine the equation of the estimated regression line. (Round all numerical values to four decimal places.)
y = -15.3081 + 0.0939x
(b) Calculate a point estimate for true average efficiency ratio when tank temperature is 183. (Round your answer to four decimal places.)
1.8756
(c) Calculate the values of the residuals from the least squares line for the four observations for which temperature is 183. (Round your answers to two decimal places.)
(183, 0.84)
|-1.03
(183, 1.75)
|-0.12
(183,…
The efficiency for a steel specimen immersed in a phosphating tank is the weight of the phosphate coating divided by the metal loss (both in mg/ft?). An article gave the accompanying data on tank temperature (x) and efficiency ratio (y).
Temp.
173
175
176
177
177
178
179
180
Ratio
0.94
1.21
1.44
1.05
1.09
1.02
0.96
1.88
Temp.
183
183
183
183
183
184
184
185
Ratio
1.53
1.50
1.57
2.07
2.05
0.86
1.53
0.80
Temp.
185
185
185
187
187
188
189
191
Ratio
1.71
1.96
2.76
1.59
2.60
3.10
1.81
3.18
In USE SALT
(a) Determine the equation of the estimated regression line. (Round all numerical values to four decimal places.)
(b) Calculate a point estimate for true average efficiency ratio when tank temperature is 185. (Round your answer to four decimal places.)
(c) Calculate the values of the residuals from the least squares line for the four observations for which temperature is 185. (Round your answers to two decimal places.)
(185, 0.80)
(185, 1.71)
(185, 1.96)
(185, 2.76)
Why do they not all have…
Chapter 4 Solutions
Student Solutions Manual for Devore's Probability and Statistics for Engineering and the Sciences, 9th
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