The article "Extravisual Damage Detection? Defining the Standard normal Tree" (Photogrammetric Engrg. Remote Sensing, 1981: 515-522) discusses the use of color infrared photography in identification of normal trees in Douglas fir stands. Among data reported were summary statistics for green-filter analytic optimal densitometric measurement on samples of both healthy and diseased trees. For a sample of 69 healty trees, the sample mean dye-layer density was 1.028, and the sample standard deviation was .163. Suppose the investigators had made a rough guess of .16 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of .05 for a confidence level of 95%?

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The article "Extravisual Damage Detection? Defining the Standard normal Tree"
(Photogrammetric Engrg. Remote Sensing, 1981: 515-522) discusses the use of color
infrared photography in identification of normal trees in Douglas fir stands. Among
data reported were summary statistics for green-filter analytic optimal densitometric
measurement on samples of both healthy and diseased trees. For a sample of 69 healty
trees, the sample mean dye-layer density was 1.028, and the sample standard deviation
was .163. Suppose the investigators had made a rough guess of .16 for the value of
s before collecting data. What sample size would be necessary to obtain an interval
width of .05 for a confidence level of 95%?
Transcribed Image Text:The article "Extravisual Damage Detection? Defining the Standard normal Tree" (Photogrammetric Engrg. Remote Sensing, 1981: 515-522) discusses the use of color infrared photography in identification of normal trees in Douglas fir stands. Among data reported were summary statistics for green-filter analytic optimal densitometric measurement on samples of both healthy and diseased trees. For a sample of 69 healty trees, the sample mean dye-layer density was 1.028, and the sample standard deviation was .163. Suppose the investigators had made a rough guess of .16 for the value of s before collecting data. What sample size would be necessary to obtain an interval width of .05 for a confidence level of 95%?
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