EXPERIMENT 2:

A pharmaceutical company is investigating a novel drug that impacts craving (desire) for high fat foods. The company is interested in whether or not the drug will influence weight in adults. An experiment is conducted in which 15 adults are selected and given the experimental drug for six months. The weights are recorded at baseline (prior to receiving the drug) and after being on the drug for 6 months (follow-up). The average weight at baseline was 177 lbs. The average weight at follow-up was 163 lbs.

• D= -11.8 with s² (i.e., the variance) = 9.3
• We will use = .05

What type of t-test should be used for this experiment?

Group of answer choices

One-way between subjects ANOVA

Independent samplest-test

standard deviation

Paired samples (i.e., repeated measures/within-subjects)t-test

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For experiment 2 (on weight loss drug), which option correctly shows the null hypothesis in appropriate statistical notation?

Group of answer choices

_D = 0

_D 0

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For experiment 2 (on weight loss drug), based on the information provided above and the formula on the supplemental material, what are the degrees of freedom for this study?

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For experiment 2 (on weight loss drug), given the df above, what is the critical value, for a two-tailed test? (Use the table provided in the supplemental material; be sure to list 3 decimal places out, like what you see in the table)

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For experiment 2 (on weight loss drug), what is the standard error for the t statistic (i.e., the bottom part of the t formula; remember the formula for calculating this has been provided in the supplemental material)?

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For experiment 2 (on weight loss drug), what is the value of the t-statistic you calculated?

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For experiment 2 (on weight loss drug), should the null hypothesis be accepted or rejected?

Group of answer choices

Rejected

Accepted

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For experiment 2 (on weight loss drug), which option most accurately describes the findings from this study? (hint: look at your decision to the above question along with the means)

Group of answer choices

The novel drug did not result in any difference or change in weight from baseline to follow-up.

The novel drug resulted in a decrease in weight from baseline to follow-up.

The novel drug resulted in an increase in weight from baseline to follow-up.

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