To test whether sales and day of the week are independent, the following random

Question

To test whether sales and day of the week are independent, the following random sample was collected:

For example, in the sample, in 30 observations it was a week day with moderate sales; in 25 observations it was a day on a week end with high sales, etc.

If sales and day of the week are independent, what would be the "expected frequency" of a week day with low sales in the above data?

(Provide one decimal position)

sales - low sales - moderate sales - high a week day 13 30 15 a day on week end 20 35 25

Explanation / Answer

Ans:

Expected frequency=row sum*column sum/overall sum

Expected frequency(weekday,low sales)=33*58/138=13.9

Observed frequency sales - low sales - moderate sales - high Total a week day 13 30 15 58 a day on week end 20 35 25 80 Total 33 65 40 138 Expected frequency sales - low sales - moderate sales - high Total a week day 13.9 27.3 16.8 58 a day on week end 19.1 37.7 23.2 80 Total 33 65 40 138

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