An article in Electronic Packaging and Production (2002, vol.42) considered the effect of X-ray inspection of integratedcircuits. The radiation dose (rads) were studied as a function ofcurrent (in milliamps) and exposure (in minutes).The data are inexcel file uploaded to Moodle. Name of the file is “Assignment 4Data”. Use a software (preferable MINITAB) to answer the followingquestions

Part 2. Now, add current to the model and perform multipleregression analysis. (Include the output in your pdf file.)

a) Write the fitted model.

b) Is the model overall significant? Test at significance levelof 5%.

c) Is current a significant variable for the model? Test atα=0.05.

d) Use the model to estimate mean radiation dose when thecurrent is 25 mA and exposure time is 30 seconds.

e) Do you observe an improvement in coefficient ofdetermination? Explain

***Assume that you have data of radiation dose, exposure timeand mA for 40 samples. Can you solve the problem above usingminitab amd show the steps please?

Rads	mA	Exposure 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