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The NAEP test was also given to a sample of 1077 women of ages 21 to 25 years. Their mean quantitative score was 275. Take it as known that the standard deviation of all individual scores is = 60.

1. Give the 90% confidence interval for the mean score in the population of all young women.

2. Give the 95% and 99% confidence interval for the mean score.

3. What is the effect of confidence levels on confidence intervals?

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