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?

1. mu1 =\= mu2 (is not equal to)

2. mu1 > mu2

3. mu1 < mu2

4. mu1 = mu2

Using the data above, what is the Welch's critical t-value using the simplified textbook method and Tables when testing the claim that Fertilizer A is significantly greater than Fertilizer B?

Record the answer to three decimal places (x.xxx).

Using the data above, what is the t-statistic rounded off to one decimal place ? (x.x)

Lastly, using the data from above again, Fertilizer A is significantly greater than Fertilizer B using an alpha of 0.025. True or False.