Question

Researchers hypothesize that a new oral contraceptive will produce weight loss. In a study, healthy females were weighed (lb) at the beginning of a course of the new oral contraceptive. They were reweighed at 2 months. What can the researchers conclude with an α of 0.01? The data are below.

initial weight	2-month weight
140 141 137 130 140 158 147 145 148 140	150 119 144 141 144 163 146 145 151 144

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:

2 months

new oral contraceptive

beginning

healthy females

weight  

Condition 2:
2 months new oral contraceptive beginning healthy females weight  

c) Compute the appropriate test statistic(s) to make a decision about H₀.
(Hint: Make sure to write down the null and alternative hypotheses to help solve the problem.)
critical value =   ; test statistic =   
Decision: Reject H0 Fail to reject H0  
If appropriate, compute the CI.
[   ,   ]
Compute the corresponding effect size(s) and indicate magnitude(s).
If not appropriate, input and/or select "na" below.
d =   ; na trivial effect small effect medium effect large effect  
r² =   ; na trivial effect small effect medium effect large effect

Answer 1

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