The following table shows a portion of the results from a clinical trial investigating the effectiveness of a monoamine oxidase inhibitor as a treatment for depression (207). The relationship between y, the percentage of subjects showing improvement, and x, the patient€™s age, appears to be S-shaped. Graph the data and superimpose a graph of the least squares curve y = L/1 + ea+bx. Take L to be 60.

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Age Group Age Mid-Point, x % Improved, y In ( [28, 32) [32, 36) [36, 40) [40, 44) [44, 48) [48, 52) [52, 56) [56, 60) 30 34 38 42 46 50 54. 58 14 19 32 42 48 50 52 1.49393 1.18958 0.76913 -0.13353 -0.84730 1.38629 1.60944 -1.87180