Question

Drug concentrations​ (measured as a​ percentage) for 25 randomly selected tablets are shown in the accompanying table. For comparisons against a standard​ method, the scientists desire an estimate of the variability in drug concentrations. Obtain the estimate for the population variance for the scientists using a 95​% confidence interval. Interpret the interval.

91.06
92.09
89.98
91.67
82.88
94.09
89.73
89.34
84.27
87.34
89.14
91.67
84.31
89.95
92.28
92.14
84.72
90.02
92.23
89.95
89.17
89.24
92.87
88.57
89.55

Answer 1

Solution:-

95% Confidence interval for the population variance = (5.1036 , 16.1999)