Question

NAME BIOL 130 Read over the statistical appendix at the end of your lab packet, paying particular attention to examples one and two. Use this information to help you with the following sample problems. CRICKET BEHAVIOR PRELAB PRACTICE DATA ANALYSIS 1. Experiment A in your cricket lab tests the following hypothesis: The behavior of Cricket 1 will be significanty different from the behavior of Cricket 2 when they are interacting with each other z2 CONTINGENCY TABLE TEST What is your null hypothesis? The following table provides a sample data set, similar to what you might get after 15 minutes of observation. 2. SAMPLE RESULTS FROM CRICKET EXPERIMENT A: Observed Data Cricket 1 Cricket 2 Solitary 20 15 Neutral 16 3. Calculate the row and column totals for your sample observed data table above and construct a second data table of expected values. Aggressive Neutral Cricket 1 Cricket 2 4. Look closely at your expected values for "neutral behaviors. Are they < 5? If so, then you must ignore the "Neutral behavior category, because you have too few data to test this category properly. Eliminate the neutral category in both your observed and expected tables and re- calculate your row and column totals. Your data tables will now only contain 4 cells Expected Data Solitary Aggressive Cricket 1 Cricket 2

Answer 1

Answer 1

Null hypothesis is as follows:

H0​: The the behavior of cricket 1 will not be significantly different from the behavior of cricket 2 when they are interacting with each other.

Answer 3

Column 1 20 15 35 Column 2 Column 3 Row 1 Row 2 Total Total 24 32 56 16 18 The expected values are computed in terms of row and column totals. In fact, the formula is E FG, where R, corresponds to the total sum of elements in row i, C, corresponds to the total sum of elements in column j, and T is the grand total. The table below shows the calculations to obtain the table with expected values Expected Values Row 1 Row 2 Total Column 1 Column 2 1524 7.714 S32 10.286 18 Column 3 Total 24 32 56 35x2415 332 1.714 35

Answer 4

Total Column 1 20 15 35 Column 2 Row 1 Row 2 Total 16 31 18 53 The expected values are computed in terms of row and column totals. In fact, the formula is Ei RC, where R, corresponds to the total sum of elements in row i, C, corresponds to the total sum of elements in column j, and T is the grand total. The table below shows the calculations to obtain the table with expected values Total Expected Values Row 1 Row 2 Total Column 1 350 = 14.528 531 20.472 35 Column 2 182 = 7.472 810.528 18 ) 31 53