Name ______Section _____

BS 105 Environmental Variables Assignment

1.Using the pooled data, calculate the Χ2value for each situation. To accomplish this task, simply fill in the charts below. (4 points)

Environmental Condition / Observed (o) / Expected (e) / (o-e) / (o-e)2 / (o-e)2
e
Acidic pH / 82 / 525 / - 443 / 196,249 / 373.8
Basic pH / 968 / 525 / 443 / 196,249 / 373.8

Χ2 = 747.6

Environmental Condition / Observed (o) / Expected (e) / (o-e) / (o-e)2 / (o-e)2
e
Moist
Dry

Χ2 =

Environmental Condition / Observed (o) / Expected (e) / (o-e) / (o-e)2 / (o-e)2
e
Light
Shade

Χ2 =

Environmental Condition / Observed (o) / Expected (e) / (o-e) / (o-e)2 / (o-e)2
e
Food
No Food

Χ2 =

Answers to the following questions MUST be typed double-spaced. Answers that are not typed will not be graded and will receive a grade of zero.

This is not a group assignment. Work independently. Papers that are not individual work will receive a grade of zero.

Staple your typed answers to this page. You do not need to retype the question, but you must clearly label your answers with the question number and letter.

2.What are the null and alternative hypotheses for each environmental situation? [Hint: Look at the Chi-square handout for a brief explanation of null vs. alternative hypothesis. If you’re still confused, please ask!] (8 points)

A:Acid/Base Experiment:

B.Moist/Dry Experiment:

C.Light/Shade Experiment:

D.Food/No Food Experiment:

3.What are the dependent, independent, and controlled variables for these experiments? (7 points)

A.Dependent Variable (1)

B.Independent Variables (4)

C.Controlled Variables (at least 2)

4.Which hypotheses do you accept, and which do you reject? Explain your answer for each pair of hypotheses! (8 points)

5.On the basis of the results from the Chi-square analysis, what conclusions can you make concerning the preferred environmental conditions for pill bugs? (2 points)