Suppose that we have a population of fungal spores which clearly fall into two s

Question

Suppose that we have a population of fungal spores which clearly fall into two size categories, large and small. We incubate these spores on agar and count the number of spores that germinate by producing a single outgrowth or multiple outgrowths. The null hypothesis is that spore size and outgrowth are independent of each other. Based on the actual data shown below what is the expected number of large spores with single outgrowths (give answer to 1 decimal place)? Use this handy chi-squared calculator. Small Spore 10 21 Large Spore 13 18 Single Outgrowth Multiple Outgrowths

Explanation / Answer

Grand Total = 10 + 13 + 21 + 18 = 62

The expected number of large spores with single outgrowths is computed here as:

= (Row Sum )*(Column Sum ) / Grand Total

= (23)*(31)/62 = 11.5

Therefore 11.5 is the expected value here

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