Step 1 Given mean wake time of 22 subjects before treatment is 103 minutes. After treatment 22 subjects have mean wake time 79.9 minutes and standard deviation 20.3 minutes and normally distributed. The Z critical score for 90% donfidence interval is calculated with reference to below shown table. The Z score for probability value 0.9495 is 1.64 and Z score for probability value 0.9505 is 1.65. So on average the Z score of 0.95 probability is 1.645.

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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.