Two equal groups of seedlings, and equal in height, were selected for an experiment. One group of seedlings was fed Fertilizer A, and the other group with Fertilizer B. The mean heights of the two groups of seedlings, their standard deviations, and sample sizes are listed below. Assume simple random sampling, independence, and normally distributed data. Alpha = 0.025.

Sample Mean Height (inches, Std Deviation (inches), Sample Size

Fertilizer A 12.92, 0.25, 15

Fertilizer B 12.63, 0.20, 13

What is the null hypothesis?