A botanist claims that using a newly developed chemical will increase the yield of a vegetable crop. They conduct a significance test on their clinical study:

H₀: Using the chemical does not increase yield.

H_a: Using the chemical increases yield.

They collect a random sample, evaluate the data, and decide to not reject the null hypothesis and do not believe that the chemical increases yield. They later find out that the chemical does, in fact, increase the yield.

What type of error did they commit?

	A.	an error of the third kind
	B.	Bias in Sampling
	C.	Type I error
	D.	Type II error
	E.	Calculation Error