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Unformatted text preview: this case the mean would have been 38.6, and an upper bound would have been 38.6 + 10.5 = 49.1. This
interpretation would be that the mean time between the onset of Cushing’s disease and its diagnosis is no greater than
46. The statistics, including standard errors are in the table. The upper
confidence bound is given by 2,63 6 + 1.753(127) = 2,636 + 222.6 = 2,858.6.
The mean decrease in modulus of elasticity of the composite beams four
weeks from formation is no greater than 2,858.6. The normal pro bability plot
of the differences does not indicate any systematic departure from normality. 1 min
15 By the way, the intercept of a normal probability plot of data versus z scores occurs at or near the
sample mean. The slope is approximately equal to the sample s tandard deviation. mean
509 std err
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- Spring '04
- Standard Error