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Explanation:
If a business regularly deals with toxic substances, all staff interacting with these hazardous materials must <span>receive training on how to handle and dispose of them safely! This is of utmost importance.</span>
Answer:
The estimated 90% confidence interval for the average depth of all frames in the consignment ranges from a lower boundary of 105.419 mm to an upper boundary of 106.581 mm.
Explanation:
The confidence interval for the mean is calculated as mean +/- margin of error (E)
mean = 106 mm
sample sd = 3.5mm
n is the sample size = 100
degree of freedom = n-1 = 100-1 = 99
confidence level (C) = 90% = 0.9
significance level = 1 - C = 1 - 0.9 = 0.1 = 10%
the critical value (t) for 99 degrees of freedom at a 10% significance level is 1.6602
E = t × sample sd/√n = 1.6602×3.5/√100 = 0.581 mm
Lower limit of mean = mean - E = 106 - 0.581 = 105.419 mm
Upper limit of mean = mean + E = 106 + 0.581 = 106.581 mm
The 90% confidence interval is (105.419 mm, 106.581 mm)
