A research reports a comparison of 2 methods for predicting the strength of 9 different types...

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A research reports a comparison of 2 methods for predicting thestrength of 9 different types of steel. The following table showsthe results of this research. a) We wish to determine whether thereis any difference in the predicted mean strength for the twomethods at 1% alpha level. b) Solve part (a) by Minitab and reportthe results.
Steel type
Method 1
Method 2
1
1.186
1.061
2
1.151
0.992
3
1.322
1.063
4
1.339
1.062
5
1.2
1.065
6
1.402
1.178
7
1.365
1.037
8
1.537
1.086
9
1.559
1.052
a) We wish to determine whether there is any difference in thepredicted mean strength for the two methods at 1% alpha level.
b) Solve part (a) by Minitab and report the results.

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4.2 Ratings (488 Votes)

Solution a State the hypotheses The first step is to state the null hypothesis and an alternative hypothesis Null hypothesis ud 0 Alternative hypothesis ud 0 Note that these hypotheses constitute a twotailed test The null hypothesis will be rejected if the difference between sample means is too big or if it is too small Formulate an analysis plan For this analysis the significance level is 001 Using sample data we will conduct a See Answer

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Steel type	Method 1	Method 2
1	1.186	1.061
2	1.151	0.992
3	1.322	1.063
4	1.339	1.062
5	1.2	1.065
6	1.402	1.178
7	1.365	1.037
8	1.537	1.086
9	1.559	1.052