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Bacteriology Experiment 1: Effects of hand washing vs. sanitizer (week 2) ANALYSIS Effectiveness of hand soap and hand sanitizer (con't) Mean The mean is simply the average. If you find that there is a significant p value (p < 0.05), then the next step is to look at the mean. If the mean is larger for the "BEFORE" treatment, this means that microbial diversity is higher before the treatment is applied. If the mean is larger for the "AFTER" treatment, this means microbial diversity is actually higher after the treatment. If the p value is insignificant (p?0.05), we assume there is no difference between those means. In other words, the results for our experiment are inconclusive for the ability of our treatment (soap or sanitizer) to either decrease or increase microbial diversity. PAIRED T-TEST (before vs. after) p < 0.05 SIGNIFICANT ?BEFORE < ?AFTER "treatment increased microbial diversity" ?BEFORE > ?AFTER "treatment decreased microbial diversity" p ? 0.05 INSIGNIFICANT "treatment has no effect on microbial diversity" Figure 6. Interpreting the results of the "before" vs. "after" treatment. Practice Interpretation 4. If your results from the paired t-tests indicated that both treatments had p > 0.05, what can you conclude about the effectiveness of those treatments in controlling microbial diversity? Note: this is a practice interpretation. Do not use your actual class data

          Bacteriology
Experiment 1: Effects of hand washing vs. sanitizer (week 2)
ANALYSIS
Effectiveness of hand soap and hand sanitizer (con't)
Mean
The mean is simply the average. If you find that there is a significant p value (p < 0.05), then the next step is to look at the mean. If the mean is larger for the "BEFORE" treatment, this means that microbial diversity is higher before the treatment is applied. If the mean is larger for the "AFTER" treatment, this means microbial diversity is actually higher after the treatment. If the p value is insignificant (p?0.05), we assume there is no difference between those means. In other words, the results for our experiment are inconclusive for the ability of our treatment (soap or sanitizer) to either decrease or increase microbial diversity.
PAIRED T-TEST
(before vs. after)
p < 0.05
SIGNIFICANT
?BEFORE < ?AFTER
"treatment increased microbial diversity"
?BEFORE > ?AFTER
"treatment decreased microbial diversity"
p ? 0.05
INSIGNIFICANT
"treatment has no effect on microbial diversity"
Figure 6. Interpreting the results of the "before" vs. "after" treatment.
Practice Interpretation
4. If your results from the paired t-tests indicated that both treatments had p > 0.05, what can you conclude about the effectiveness of those treatments in controlling microbial diversity?
Note: this is a practice interpretation. Do not use your actual class data

Bacteriology
Experiment 1: Effects of hand washing vs. sanitizer (week 2)
ANALYSIS
Effectiveness of hand soap and hand sanitizer (con't)
Mean
The mean is simply the average. If you find that there is a significant p value (p < 0.05), then the next step is to look at the mean. If the mean is larger for the "BEFORE" treatment, this means that microbial diversity is higher before the treatment is applied. If the mean is larger for the "AFTER" treatment, this means microbial diversity is actually higher after the treatment. If the p value is insignificant (p?0.05), we assume there is no difference between those means. In other words, the results for our experiment are inconclusive for the ability of our treatment (soap or sanitizer) to either decrease or increase microbial diversity.
PAIRED T-TEST
(before vs. after)
p < 0.05
SIGNIFICANT
?BEFORE < ?AFTER
"treatment increased microbial diversity"
?BEFORE > ?AFTER
"treatment decreased microbial diversity"
p ? 0.05
INSIGNIFICANT
"treatment has no effect on microbial diversity"
Figure 6. Interpreting the results of the "before" vs. "after" treatment.
Practice Interpretation
4. If your results from the paired t-tests indicated that both treatments had p > 0.05, what can you conclude about the effectiveness of those treatments in controlling microbial diversity?
Note: this is a practice interpretation. Do not use your actual class data

Added by James S.

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