A sample of 20 from a population produced a mean of 66.0 and a standard deviation of 10.0. A sample of 25 from another population produced a mean of 58.6 and a standard deviation of 13.0. Assume that the two populations are normally distributed and the standard deviations of the two populations are equal. The null hypothesis is that the two population means are equal, while the alternative hypothesis is that the two population means are different. The significance level is 5%. Directions: • Label your answers with the correct statistical symbols.
3.2. By hand, what is the standard deviation of the sampling distribution of the difference between the means of these two samples, rounded to three decimal places?
3.3. What is/are the critical value(s) for the hypothesis test?
3.4. By hand, derive the corresponding 95% confidence interval for the difference between the means of these two populations, rounded to three decimal places.
3.5. What is the value of the test statistic rounded to three decimal places?
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