Q. No

5(a)

5(b)

5(c)

Module 5

The following are the weight losses of a certain machine parts (in milligrams ) due to
friction when 3 different lubricants were used under controlled conditions.

LubricantA: 12.2 11.8 13.1 11.0 3.9 4.1 10.3 8.4
LubricantB: 10.9 5.7 13.5 9.4 11.4 15.7 10.8 14.0
Lubricant 0: 12.7 19.9 13.6 11.7 18.3 14.3 22.8 20.4

Test at 1% level whether the difference among the means can be attributed to chance

Answer b orc

A laboratory technician measures the breaking strength of each of 5 kinds of
linen thread by means of 4 different instruments and obtains the following
results

24.3
25.2

Perform 2 way ANOVA to test whether the means between thread type and
the mean between measuring instruments are significant or not at 1% level of
significance

Thread type

The following data resulted from an experiment to compare three burners By,
82 and 83. A Latin square design was used as the tests were made on 3
engines and were spread over 3 days.

Engine1 | Engine2 Engine3
B,-16 82-17 83-20

Test the hypothesis that there is no difference between the burners