BIOL 3327 Experimental Methods - Lecture 6 Review

These flashcards cover key concepts related to normal distributions, statistical significance, and experimental frameworks as presented in the lecture.

What is a characteristic of normal distribution in data analysis?

It allows us to sample to determine statistical significance.

What statistical measures can replace a frequency histogram in data representation?

Mean and standard deviation.

What is the mean egg weight calculated in the experiment?

65.1 ±1.6g.

How do female D. melanogaster compare to D. simulans in terms of bristle number?

D. melanogaster have a higher average thoracic bristle count.

What is the purpose of calculating the standard error of the difference between means (s.e.d.m.)?

To determine if two populations differ significantly.

What does a difference of 9 in means indicate?

It suggests that the populations may differ, requiring further statistical analysis.

How are the means of individual samples related to their variance?

The variance of means is the variance of single data points divided by the sample size (n).

What does a standard error (s.e.) represent in statistical terms?

It is equivalent to the standard deviation (s) for means.

What percentage of the population is expected to fall within the range of 2 standard deviations?

95% of the population.

What is the significance of a difference exceeding 2 s.e.d.m. in two populations?

It indicates that the populations are likely to be significantly different, P < 0.05.

What should be considered when establishing an experimental framework?

The hypothesis, the question being asked, and the model to be developed.