Nestling mass and nest humidity. Researchers investigated the relationshipbetween

Chapter 0, Problem 28.7

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Nestling mass and nest humidity. Researchers investigated the relationshipbetween nestling mass, measured in grams, and nest humidity index, measured asthe ratio of total mass of water in the nest divided by nest dry mass, for twodifferent groups of great titmice parents.2 One group was exposed to fleas during egg laying and the other was not. Exposed parents were coded as 1, andunexposed parents were coded as 0. Use the output above, obtained by fitting amultiple regression model with parallel lines for the two groups of parents, toanswer the following questions.(a) Identify the regression model for predicting nestling mass from nest humidityindex for the two groups of great titmice parents.(b) Based on your model, do you think that nestling mass was higher in nests ofbirds exposed to fleas during egg laying? Explain.(c) What is the value of the regression standard error? Interpret this value.(d) What is the value of the squared multiple correlation coefficient? Interpretthis value.