Independent random samples were selected from two quantitative populations, with sample sizes, means, and variances given Construct a 90% and a 99% confidence interval for the difference in the population means. What does the phrase “90% confident” or “99% confident”

mean?

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2. 1 Population 2 Sample Size 64 64 Sample Mean 3.9 5.1 Sample Variance 9.83 12.67