The concentration of active ingredients in a liquid laundry detergent is thought to be affected by the type of catalyst used in the process.

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Question 1

The concentration of active ingredients in a liquid laundry detergent is thought to be affected by the type of catalyst used in the process. Ten observations on concentration are taken for each catalyst and the data is shown in Table 1.

Table 1: Concentration recorded for Catalyst 1 and 2.

(a)

Catalyst 1

25 35 26 40 46

45 31 33 29 21

Catalyst 2

31 15 25 19 28

19 18 24 10 20

Test the difference between catalyst 1 and catalyst 2. Use a = 0.01 and assume unequal variances.

(i) Include a relevant MINITAB output.

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