Question

Use SPSS for this Application Exercise:
As part of a study of wheat maturation, an agronomist selected a sample of wheat plants at random from a field plot. For each plant, the agronomist measured the moisture content from two locations: one from the central portion and one from the top portion of the wheat head. The agronomist hypothesizes that the central portion of the wheat head has more moisture than the top portion. What can the agronomist conclude with α = 0.10? The moisture content data are below.

central	top
61.7 63.6 60.2 62.5 61.6 62.8 62.3	62.7 63.6 60.9 63.1 62.7 63.7 62.5

a) What is the appropriate test statistic?
---Select--- na z-test One-Sample t-test Independent-Samples t-test Related-Samples t-test

b)
Condition 1:
---Select--- moisture content wheat maturation wheat head top portion central portion
Condition 2:
---Select--- moisture content wheat maturation wheat head top portion central portion

c) Input the appropriate value(s) to make a decision about H₀.
(Hint: Make sure to write down the null and alternative hypotheses to help solve the problem.)
p-value =  ; Decision:  ---Select--- Reject H0 Fail to reject H0

d) Using the SPSS results, compute the corresponding effect size(s) and indicate magnitude(s).
If not appropriate, input and/or select "na" below.
d =  ;   ---Select--- na trivial effect small effect medium effect large effect
r² =  ;   ---Select--- na trivial effect small effect medium effect large effect

e) Make an interpretation based on the results.

The central portion of the wheat head had significantly more moisture than the top portion.

The central portion of the wheat head had significantly less moisture than the top portion.     

There was no significant moisture difference between the central and top portion of the wheat head.

Answer 1