Question: Stevens (1966), citing Dimmick and Hubbard (1939), reported data from 20 studies of the color perception of unitary hues. The wavelength (in millimeters) of light

Stevens (1966), citing Dimmick and Hubbard (1939), reported data from 20 studies of the color perception of unitary hues. The wavelength (in millimeters) of light called green by subjects in each experiment is given in the following table, along with the year the study was conducted.

a. These data stimulate the question "Is there any linear trend over time in the wavelength of light called green?" Evaluate this question by finding the least-squares estimates of the straight-line regression function for predicting wavelength from year.
b. Find a 95% confidence interval for the true slope.
c. Draw a scatter diagram on graph paper.

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