Question

the trees on two different plots of land are tested for disease. the results are shown in this table. enter numbers in the boxes so that the two - way table represents these results.

	plot a	plot b
disease not present	\square	\square
tree	plot	disease present?
1	a	y
2	a	n
3	b	y
4	b	y
5	b	y
6	a	n
7	b	n

Explanation:

Step1: Count Disease present in Plot A

Check rows where Plot is A and Disease present is Y. Tree 1: Plot A, Y. So count = 1.

Step2: Count Disease present in Plot B

Check rows where Plot is B and Disease present is Y. Trees 3,4,5: Plot B, Y. So count = 3.

Step3: Count Disease not present in Plot A

Check rows where Plot is A and Disease present is N. Trees 2,6: Plot A, N. So count = 2.

Step4: Count Disease not present in Plot B

Check rows where Plot is B and Disease present is N. Tree 7: Plot B, N. So count = 1.

Answer:

For the two - way table:

	Plot A	Plot B
Disease not present	2	1

So the numbers to fill are (from top - left to bottom - right in the two - way table boxes): 1, 3, 2, 1.