Question: A researcher has constructed an 80% confidence interval of u=45 + 8 , using a sample of n=25 scores.

1. What would happen to the width of the interval if the researcher had used a larger sample size?
2. What would happen to the width of the interval if the researcher had used 90% confidence instead of 80%?
3. What would happen to the width of the interval if the sample variance increased? (assume other factors are held constant.)

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