Question

In the strawberry dataset (last page), a parcel of land was divided into 6 equally sized plots (blocks), and each block was divided into 3 equally sized subplots. 3 nitrogen treatments were randomly assigned to the subplots within each plot. Data collected are pounds of yield of strawberries per plot. Does added nitrogen increase the production of strawberries?

Carry out a hypothesis test to answer this question. Use a graph to illustrate the results.

strawberries

	strawberry yield with
Block	no added N	10 lbs/ha N	100 lbs/ha N
1	105	156	187
2	98	145	167
3	125	170	201
4	100	150	180
5	130	185	210
6	80	135	162

Answer 1

Hypothesis:

H0 : no added N = 10 lbs/ha N = 100 lbs/ha N

Ha : no added N < 10 lbs/ha N < 100 lbs/ha N

reject H0 because p value < 0.05 , therefore nitrogen increase the production of strawberries