25 Jul WHAT IS THE DEPENDENT VARIABLE?
vSuppose you are an aquatic ecologist studying freshwater crayfish. You notice that crayfish in fast- Show more Suppose you are an aquatic ecologist studying freshwater crayfish. You notice that crayfish in fast-flowing rivers generally seem to be smaller than those in slow-flowing rivers. In an effort to test your hunch about water speed you collect 15 crayfish from a fast-flowing river and 15 from a slow-flowing river and measure body length for each crayfish. The body lengths are provided below in centimeters. Crayfish from fast river: 12.5 12.7 12.3 12.4 12.5 12.5 11.9 12.4 12.6 12.3 12.5 12.4 12.5 12.6 12.3 Crayfish from slow river: 14.9 14.7 15.0 14.9 14.8 14.9 14.9 14.7 15.0 14.6 14.8 15.0 14.9 14.8 14.8 Write a null hypothesis and an alternative hypothesis for this experiment. What is the independent variable? What is the dependent variable? Calculate the t-test statistic and the degrees of freedom. Using table 3.1 on pg. 3-11 in your lab manual what do you conclude regarding the null hypothesis? (I.e. do you accept or reject it?) Explain how you came to this conclusion. In your own words describe the next experiment that you would conduct to further examine the impact of water flow on crayfish. Briefly describe your experimental design and provide the null and alternative hypotheses you wish to test. Convert 903.20 milligrams to decagrams. Show your work and write your final answer using proper significant figures. Show less
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