Question

Practice for Hypothesis Testing (with z)

A farmer has found over the years that the average height of a corn plant is 77.4 inches with a standard deviation of 7.3 inches.  A seed company promises that their seeds produce taller plants.  The farmer plants 45 of their seeds and the resulting plants had a mean height of 80.3 inches.  Test the seed company’s claim using  = .025 and the prob-value approach.

Answer 1