At 95% confidence interval, prove if there is a difference between the two samples? ii. At 98% confidence interval, illustrate if the same conclusion be made to 100 non-treated pieces' sample which yields an average of 12.2 millimetres of material removed, and 200 treated samples which yields an average of 9.1 millimetres, both with similar standard deviations, 1.1 and 0.9 respectively. ii. From (1) and (i), determine if the treatment be used to protect metal from corrosion?

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.