Figure 23.13 shows the relationship between parent nest size and offspring nest

Question

Figure 23.13 shows the relationship between parent nest size and offspring nest size for 100 parent-offspring observations of barn swallows, Hirundo rustica. The line is the least-squares-regression line. Note that the graph actually plots the logarithm of nest size, because nest sizes, like many measures of volume, are otherwise strongly skewed to the right. Here is a partial Excel regression output for these data: Give a 95% confidence interval for the true population heritability (slope ?) of nest size on a logarithmic scale. Round your answers to 4 decimal places. __Answer 1__ to __Answer 2__.

Explanation / Answer

Result:

Figure 23.13 shows the relationship between parent nest size and offspring nest size for 100 parent-offspring observations of barn swallows, Hirundo rustica. The line is the least-squares-regression line. Note that the graph actually plots the logarithm of nest size, because nest sizes, like many measures of volume, are otherwise strongly skewed to the right. Here is a partial Excel regression output for these data: Give a 95% confidence interval for the true population heritability (slope ?) of nest size on a logarithmic scale. Round your answers to 4 decimal places. __Answer 1__ to __Answer 2__.

n=100

df=n-2=98

95% t critical value at 98 df=1.984

Slope=0.6762, se=0.0653

95% CI = ?±t*se

= (0.6762-1.984*0.0653, 0.6762+1.984*0.0653)

=(0.5466448, 0.8057552)

=(0.5466, 0.8058)   ( four decimals)

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