Does the data fit the claim?, step by step
A packet says 1 seed in 5 will fail.
The question
A packet says 1 seed in 5 fails. Of 200 planted, 37 failed. Does that fit the claim?
Work out what the claim predicts, then compare
expected=n ÷ k
1 in 5 of 200 is 40, and the result was 37
It fits the claim
- A packet says 1 seed in 5 fails. Of 200 planted, 37 failed. Before judging the result, work out what the claim says to expect — a claim of "1 in k" over n tries predicts n ÷ k.
- 1 in 5 of 200 is 40, and the result was 37.
- A handful either side of the expected count is what a claim like this looks like when it is true — no result lands exactly on it.
How it works.
- 01
A packet says 1 seed in 5 fails. Of 200 planted, 37 failed. Before judging the result, work out what the claim says to expect — a claim of "1 in k" over n tries predicts n ÷ k.
- 02
1 in 5 of 200 is 40, and the result was 37.
- 03
A handful either side of the expected count is what a claim like this looks like when it is true — no result lands exactly on it.