75, p < .000. Ho: Mean IQ = 100. The mean difference of the sample from the test value of 100 (the average of the general population) was 29.25, with confidence intervals of 24.9 and 33.6, indicating that there is a 95% level of certainty that the true mean difference lies between these two numbers. Alternate Hypothesis

Ha: Mean IQ > 100

Level of significance: .05

This is a one-tailed test because our hypothesis has a built in direction (we are hypothesizing that the average IQ of the group of video game players will be higher than the average IQ of the general population).

Z Score = X -- X

S

Z Score = 129.25 -- 100 / 11.86

(2-tailed)
Mean Difference

95% Confidence…