< Birds > Ecologists collected data on flight capability and extinct status for a sample of 115 bird species at the time of the Maori colonization of New Zealand. The data are summarized below. Data Summary Extinct Not Extinct Total Can Fly 16 71 87 Cannot Fly 21 7 28 Total 37 78 115 Ecologists want to know whether or not flight status (flying or not) and extinct status (extinct or not) are related. Question 4 < Birds > Ecologists want to know if flight status (flying or not) and extinct status (extinct or not) are related or not. (a) Which chi-square test should they use? Goodness-of-Fit Test (b) What is the null hypothesis of the test? Flight capability and extinct st
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In this case, since we are comparing two categorical variables (flight capability and extinct status) to see if they are related, we should use the Chi-Square Test for Independence. Show more…
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Lucas F.
Extinct birds. Biologists at the University of California (Riverside) are studying the patterns of extinction in the New Zealand bird population. (Evolutionary Ecology Research, July 2003.) At the time of the Maori colonization of New Zealand (prior to European contact), the following variables were measured for each bird species: a. Flight capability (volant or flightless) b. Type of habitat (aquatic, ground terrestrial, or aerial terrestrial) c. Nesting site (ground, cavity within ground, tree, cavity above ground) d. Nest density (high or low) e. Diet (fish, vertebrates, vegetables, or invertebrates) f. Body mass (grams) g. Egg length (millimeters) h. Extinct status (extinct, absent from island, present) Identify each variable as quantitative or qualitative.
Sri K.
Ornithologists, scientists who study birds, tag sparrow hawks in 13 different colonies to study their population. They gather data for the percent of new sparrow hawks in each colony and the percent of those that have returned from migration. Percent return:74; 66; 81; 52; 73; 62; 52; 45; 62; 46; 60; 46; 38 Percent new:5; 6; 8; 11; 12; 15; 16; 17; 18; 18; 19; 20; 20 a. Enter the data into your calculator and make a scatter plot. b. Use your calculator’s regression function to find the equation of the least-squares regression line. Add this to your scatter plot from part a. c. Explain in words what the slope and y-intercept of the regression line tell us. d. How well does the regression line fit the data? Explain your response. e. Which point has the largest residual? Explain what the residual means in context. Is this point an outlier? An influential point? Explain. f. An ecologist wants to predict how many birds will join another colony of sparrow hawks to which 70% of the adults from the previous year have returned. What is the prediction?
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