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)

Explanation / Answer

Expected frequency of weekday with low sales

= (Row total * Column total) / (Grand total)

= ((10 + 30 + 15) * (10 + 20)) / (10 + 30 + 15 + 20 + 35 + 25)

= 12.2

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