Answer:
a) 423.458
b) 9.53
c) 1.94
d) 424.5
e) 0.2916
Step-by-step explanation:
We are given the following in the question:
426, 433, 415, 420, 420, 438, 417, 410, 430, 434, 423, 426, 412, 434, 435, 432, 409, 426, 409, 436, 422, 430, 411, 415
a) point estimate of the mean oxide thickness
b) point estimate of the standard deviation of oxide thickness
where are data points,
is the mean and n is the number of observations.
Sum of squares of differences = 2089.958
c) standard error of the point estimate
Standard error =
d) point estimate of the median oxide thickness
Sorted data: 409, 409, 410, 411, 412, 415, 415, 417, 420, 420, 422, 423, 426, 426, 426, 430, 430, 432, 433, 434, 434, 435, 436, 438
Median =
e) proportion of wafers in the population that have oxide thickness greater than 430 angstrom
Sample size, n = 24
Number of wafers with oxides greater than 430 angstrom, x = 7