Does an insect electrocuting device reduce mosquito biting? Researchers equipped suburban yards with either an insect electrocuting device, a standard 6-volt CDC trap, or no device. People serving as bait captured mosquitos com- ing to bite in each yard. The investigators took steps to allow for differences among yards and differences in attractiveness of the volunteers as mosquito bait. Details of the experiment are given in Nasci, Harris, and Porter (1983). The response for each yard is the percentage of the highest total number of mosquitos collected in any yard that night. The results are shown below. Device Electrocuting device CDC trap None 66 100 100 82 75 55 Percentage of maximum mosquito count 87 97 57 85 75 88 84 91 57 100 50 86 100 63 31 61 77 100 74 83 58 58 44 40 87 100 94 89 62 87 a. Plot the observations. b. Use a parametric analysis to test the null hypothesis that the mean mosquito response is the same for each device. Do the assumptions of the analysis seem reasonable? c. Go through the steps for a nonparametric analysis. Do the assumptions of this analysis seem reasonable? d. Compare your results in parts (b) and (c). Discuss your findings. e. Why did the investigators choose as a response the percentage of highest total number of mosquitos collected in a yard in a night?
Does an insect electrocuting device reduce mosquito biting? Researchers equipped suburban yards with either an insect electrocuting device, a standard 6-volt CDC trap, or no device. People serving as bait captured mosquitos com- ing to bite in each yard. The investigators took steps to allow for differences among yards and differences in attractiveness of the volunteers as mosquito bait. Details of the experiment are given in Nasci, Harris, and Porter (1983). The response for each yard is the percentage of the highest total number of mosquitos collected in any yard that night. The results are shown below. Device Electrocuting device CDC trap None 66 100 100 82 75 55 Percentage of maximum mosquito count 87 97 57 85 75 88 84 91 57 100 50 86 100 63 31 61 77 100 74 83 58 58 44 40 87 100 94 89 62 87 a. Plot the observations. b. Use a parametric analysis to test the null hypothesis that the mean mosquito response is the same for each device. Do the assumptions of the analysis seem reasonable? c. Go through the steps for a nonparametric analysis. Do the assumptions of this analysis seem reasonable? d. Compare your results in parts (b) and (c). Discuss your findings. e. Why did the investigators choose as a response the percentage of highest total number of mosquitos collected in a yard in a night?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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Transcribed Image Text:Does an insect electrocuting device reduce mosquito biting? Researchers
equipped suburban yards with either an insect electrocuting device, a standard
6-volt CDC trap, or no device. People serving as bait captured mosquitos com-
ing to bite in each yard. The investigators took steps to allow for differences
among yards and differences in attractiveness of the volunteers as mosquito
bait. Details of the experiment are given in Nasci, Harris, and Porter (1983).
The response for each yard is the percentage of the highest total number of
mosquitos collected in any yard that night. The results are shown below.
Device
Electrocuting device
CDC trap
None
66
100
100
82
75
55
Percentage of maximum mosquito count
57
87
97
100
58
50
58
86
44
100
63
57
85
75
88
84
91
31
61
77
100
74
83
40
87
100
94
89
62
87
a. Plot the observations.
b. Use a parametric analysis to test the null hypothesis that the mean mosquito
response is the same for each device. Do the assumptions of the analysis
seem reasonable?
c. Go through the steps for a nonparametric analysis. Do the assumptions of
this analysis seem reasonable?
d. Compare your results in parts (b) and (c). Discuss your findings.
e. Why did the investigators choose as a response the percentage of highest
total number of mosquitos collected in a yard in a night?
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