Answer:
Step-by-step explanation:
a.
The experiment under study from the article involves a single factor fertilizer type, at three levels.
Hence, this is a completely randomized design with p=3 treatments.
Assuming :
are mean heights for three types of fertilizer. Therefore, the null and alternative hypotheses are:
Null hypothesis:
( i.e all type of population mean heights for three different fertilizers f are equal )
Alternative hypothesis:
( at least one of the fertilizer is not equal )
b.
This is a completely randomized design as p=3 treatment means are compared, where treatments are randomly assigned to the experimental units.
c.

d.

e.
Given that the p-value is 0.007 and F = 5.91
Also;
p-value 0.007 is less than the level of significance 0.05.
Thus ; we reject the null hypothesis and conclude that there is difference in mean of all types of the fertilizers.