The population of all verbal GRE scores are known to have a standard deviation of 8.5. The psychology department hopes to receive appliacnts with a verbal GRE score of over 210. This year, the mean verbal GRE score for the 42 applicants was 212.9 Using a alpha= 0.05 is this new mean significantly greater than the desired mean of 210? a. Is this a one-tailed test or two -tailed test? Explain why? b. Conduct the appropriate hypothesis test to determine whether the new mean is significantly greater, as hypothesised.

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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.