An organizational psychologist wants to know if attending a training session increases the productivity of workers. The organizational psychologist knows that the mean productivity of workers in the population of workers is 66 with a standard deviation of 12. The organizational psychologist took a sample of 100 workers and gave them all the training session. After training, the mean productivity was M = 68. She then compared the mean productivity of the sample workers to the mean for the population. Use ⍺ = .05. What z score should you expect if the null hypothesis is true?     1.65     68     1.96     66     0

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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.