p3 BIO 260, Spr 2012, Exam 3, Form A Name: KEY Consider an experiment where plan
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p3 BIO 260, Spr 2012, Exam 3, Form A Name: KEY Consider an experiment where plants are grown at three different temperatures and under 4 different light filters. The following 5 sets of interaction plots are used forthe next 6 questions: 15 15 blu pm org blu grm org med 15 20 25 blu grm 15 org nod 20 25 (13) Which pair of interaction plots above most likely depicts a situation in which the interactions between factors are not significant? A (14) Which pair of interaction plots above most likely depicts a situation in which color and temperature influence the mean and there is also an interaction between the two? E (15) Which pair of interaction plots above most likely depicts a situation in which temperature does not influence the mean, but the light color does? B (16) Which pair of interaction plots above most likely depicts a situation in neither factor alone influences the mean, but there is an interaction between the two? D (17) Which of the following values is the most likely value for plants grown at 20 degrees under the green light as depicted in plot E. (A) 4 (C) 10 (E) 16 (B) 7.5 (D) 13 (18) Under which of the following circumstances would the apparent trends in plot A least likely be significant? (A) There is very little variance within groups. (B) There is quite a lot of variance within groups (C) There is quite a lot of variance between groups. (D) The means sum of squares within is very small relative to the mean sum of squares among. (E) The means sum of squares among is very large relative to the mean sum of squares within.Explanation / Answer
In interaction plots if the two lines are not parallel or cross each other, then the interaction effects are significant otherwise if lines are parallel then not significant.
13-Interactions are not significant if all lines are parallel which is in Figures-A
14-color and temp influence mean and also there is interaction means line for main effects as well as interaction effects cross so option-D is most correct
15-As temperature does not influence but color does, so lines for temp are parallel while those of color are not so option-B is answer
16- as neither factor influence but there is interaction, so lines are not parallel in each pot and hence option-C is correct
17- This is 10 as green is second point above 20 in second graph in E
18-As we want trends lest likely to be significant, so option-B is answer as lot of within variation leads to low denominator
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