The following table gives rat body weights (in grams) and latency to seizure (in minutes), following injection of 40 mg/kg of body weight of metrazol.

a. Draw a scatter diagram on graph paper, with latency plotted as a function of weight.
b. Determine the least-squares estimates of slope and intercept for the straight-line regression of latency on weight.
c. Test whether the slope is equal to 0. Use α = .10.
d. Test whether the intercept is equal to 0. Use α = .10.
e. Sketch the estimated regression line.
f. Distinctly sketch your choice for a regression line if it differs from that of part (e). Explain why you agree or disagree with part (e), noting whether any assumptions appear to be violated.

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Latency Weight Latency Weight 348 372 378 390 392 395 400 2.00 1.70 2.00 2.95 1.25 2.05 3.70 409 2.30 1.95 2.90 2.30 1.10 2.50 1.30 415 423 428 464 468