4. The following data represent the operating times in hours for three types of scientific pocket calculators before recharge is required | 4.3 6.2 |5.6 Use a 0.05 level of significance, to test the hypothesis that the operating times for all three 4.9 5.5 |6.4 Calculator A 6.1 4.6 5.3 Calculator B 5.4 5.8 5.5 6.3 5.2 4.8 Calculator C 6.8 6.5 6.6 calculators are equal.

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