The Incorporation of Uranium and Silver by Hydrothermally Synthesized Galena" (Econ. Geology, 1964: 1003-1024) reports on the determination of silver content of galena crystals grown in a closed hydrothermal system over a range of temperature. With x = crystallization temperature in ?C and y = Ag2S in mol%, the data follows:

a. Estimate true average silver content when temperature is 500?C using a 95% confidence interval.

b. How would the width of a 95% CI for true average silver content when temperature is 400?C compare to the width of the interval in part (a)? Answer without computing this new interval.

c. Calculate a 95% CI for the true average change in silver content associated with a 1?C increase in temperature.

d. Suppose it had previously been believed that when crystallization temperature was 400?C, true average silver content would be. 25. Carry out a test at significance level .05 to decide whether the sample data contradicts this prior belief.

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x 398 292 352 575 568 450 550 408 484 350 503 600 600 y .15 .05 .23 43 23 .40.44.44.45 .09 59 63.60 from which Σxi = 6130, Σx2i = 3,022,050, Σyj = 4.73, Σy2i = 2.1785, Σχίyj = 2418.74, β. = .00143, β = –.311, and s = .131. x 398 292 352 575 568 450 550 408 484 350 503 600 600 y .15 .05 .23 43 23 .40.44.44.45 .09 59 63.60 from which Σxi = 6130, Σx2i = 3,022,050, Σyj = 4.73, Σy2i = 2.1785, Σχίyj = 2418.74, β. = .00143, β = –.311, and s = .131.

Answer rating: 100% (QA)

a Calculate mean as follows Putting thus value in above equation we get the estimated ... View the full answer