1. The rads (radiation dose, Y) were studied as a function of current X1(in mill
ID: 2907289 • Letter: 1
Question
1. The rads (radiation dose, Y) were studied as a function of current X1(in milliamps) and exposure time X2(in seconds). The data are in the following table (sample size n=40):
Rads
Current
Time
7.4
10
0.25
14.8
10
0.5
29.6
10
1
59.2
10
2
88.8
10
3
296
10
10
444
10
15
592
10
20
11.1
15
0.25
22.2
15
0.5
44.4
15
1
88.8
15
2
133.2
15
3
444
15
10
666
15
15
888
15
20
14.8
20
0.25
29.6
20
0.5
59.2
20
1
118.4
20
2
177.6
20
3
592
20
10
888
20
15
1184
20
20
22.2
30
0.25
44.4
30
0.5
88.8
30
1
177.6
30
2
266.4
30
3
888
30
10
1332
30
15
1776
30
20
29.6
40
0.25
59.2
40
0.5
118.4
40
1
236.8
40
2
355.2
40
3
1184
40
10
1776
40
15
2368
40
20
1.)What is the mean radiations when the current is 15 milliamps and the exposure time is 5 seconds. (Keep 1 decimal place)
2.)The 95% confidence interval for the increase in the mean radiations when the current is fixed and the exposure time change from 5 seconds to 10 seconds is approximately
A. [60.48, 130.80]
B. [12.14, 26.16]
C. [57.46, 78.70]
D. [287.30, 393.50]
Rads
Current
Time
7.4
10
0.25
14.8
10
0.5
29.6
10
1
59.2
10
2
88.8
10
3
296
10
10
444
10
15
592
10
20
11.1
15
0.25
22.2
15
0.5
44.4
15
1
88.8
15
2
133.2
15
3
444
15
10
666
15
15
888
15
20
14.8
20
0.25
29.6
20
0.5
59.2
20
1
118.4
20
2
177.6
20
3
592
20
10
888
20
15
1184
20
20
22.2
30
0.25
44.4
30
0.5
88.8
30
1
177.6
30
2
266.4
30
3
888
30
10
1332
30
15
1776
30
20
29.6
40
0.25
59.2
40
0.5
118.4
40
1
236.8
40
2
355.2
40
3
1184
40
10
1776
40
15
2368
40
20
Explanation / Answer
1.)What is the mean radiations when the current is 15 milliamps and the exposure time is 5 seconds. (Keep 1 decimal place)
Rads=-440.393+19.1475*current+68.08*time
current=15,time=5
Rads=187.22
2) The 95% confidence interval for the increase in the mean radiations when the current is fixed and the exposure time change from 5 seconds to 10 seconds is approximately
C. [57.46, 78.70]
Rads=-440.393+19.1475*current+68.08*time
current=15,time=5
Rads=187.22
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