Use a Mann-Whitney U test to analyze these data
Use a Mann-Whitney U test to analyze these data
Lefèvre et al. (2010) examined the effects of alcohol consumption on the attractiveness of humans to mosquitoes that carry malaria (that is, does drinking beer make you more likely to be bitten and potentially infected?). The study occurred in Burkino Faso, and the alcoholic beverage was a local beer (dolo) made from fermented sorghum grain. Five hundred mosquitoes at a time were allowed to choose between a chamber containing normal air and a chamber containing air with the scent of humans 15 minutes after drinking either dolo or water. The researchers recorded the proportion of mosquitoes that chose the human-scented chamber, with the following results:
|
Dolo |
Water |
|
0.49 |
0.16 |
|
0.59 |
0.14 |
|
0.27 |
0.06 |
|
0.43 |
0.08 |
|
0.50 |
0.42 |
|
0.50 |
0.26 |
|
0.37 |
0.46 |
|
0.30 |
0.39 |
|
0.58 |
0.42 |
|
0.89 |
0.66 |
|
0.67 |
0.47 |
|
0.34 |
0.52 |
|
0.48 |
0.54 |
|
0.73 |
0.41 |
|
0.80 |
0.47 |
|
0.86 |
0.49 |
|
0.77 |
0.43 |
|
0.57 |
0.45 |
|
0.87 |
|
|
0.62 |
|
|
0.93 |
|
|
1.00 |
|
|
0.81 |
|
|
0.92 |
|
|
1.00 |
Use a Mann-Whitney U test to analyze these data. As part of your answer, you should provide the ranked data for each group (including adjustments to the ranks for ties, if necessary). You should also indicate how you tested the significance of your U statistic (z-test or critical-value table), and why you chose that particular option.
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