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 *H*_{0}.

(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

*r*^{2} = ; na trivial effect small
effect medium effect large effect

Answer #1

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initial weight
3-month weight
140
117
137
130
140
158
147
145
141
140
150
119
144
141
144
163
146
145
151
144
a) What is the appropriate test...

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132
109
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122
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---Select--- na z-test One-Sample t-test Independent-Samples t-test...

Application Exercise:
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105
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132
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113
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137
115
119
115
127
122
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111
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---Select--- na z-test...

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