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An index of happiness follows a normal distribution. Two random samples of 6 individuals each reported happiness given in the table below: Groupl 22 25

An index of happiness follows a normal distribution. Two random samples of 6 individuals each reported happiness given in the table below:

Groupl 22 25 35 42 56 78 Group 2 28 30 33 52 69 88 (a) Calculate the mean and stande deviation for the level of happiness for (i) Group 1 and (ii) Group 2. (b) Construct an 80% condence interval for the population mean level of happiness for Group 1

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