You are doing an experiment measuring the effect of salinity on early sea urchin

Question

You are doing an experiment measuring the effect of salinity on early sea urchin development. With your data from 180min after mixing eggs and sperm in both normal seawater and 50% NaCl-free seawater you count the number of eggs in the 8 cell stage.

a) a) Identify the independent (x-axis) and dependent (y-axis) variables. Choices: % eggs at 8-cell stage / seawater salinity

Independent:  

Dependent:  

b) b) What type of graph is appropriate? Choices: scatterplot, column without error bars, or column with error bars  

c) c) What statistical test is appropriate? Choices: Chi-square, correlation/regression, ANOVA or t-test  

You are doing a second experiment, this time determining the effect of molecule size on red blood cell hemolysis. You want to know if there is a significant difference in the time it takes for cells to lyse when exposed to different solutions containing different sized molecules: ethylene glycole, triethylene glycol, hexaethylene glycol.

a) d) Identify the independent (x-axis) and dependent (y-axis) variables. Choices: hemolysis time / molecule size

Independent:  

Dependent:  

b) e) What type of graph is appropriate? Choices: scatterplot, column without error bars, or column with error bars  

c) f) What statistical test is appropriate? Choices: Chi-square, correlation/regression, ANOVA or t-test  

Explanation / Answer

1

a. Independent: Seawater salinity

Dependent: % of eggs at 8-celled stage

b. Column with error bars

c. t-test

2.

a. Independent: Molecule size

Dependent: hemolysis time

b. Scatter plot

c. ANOVA

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