Researchers compared cortisol levels of two samples of women at childbirth. The first group (n=50) underwent an emergency cesarean section following induced labor and had a mean cortisol level of 445 with a standard deviation of 65. The second group (n=55) delivered either by cesarean section or vaginally following spontaneous labor, and had a mean cortisol level of 650 with a standard deviation of 70. Construct a two-sided 95% confidence interval for the difference between the two means. Assume equal variances. You MUST show your work to receive full credit. Partial credit is available. Give the following in your answer: 1. The value for t and how you found it, 2. The calculation of the pooled variance, 3. The calculation of the Standard Error, 4. The calculation of the Margin of Error, 5. The calculation of the upper and lower limits, and 6. An interpretation of the confidence interval.
Researchers compared cortisol levels of two samples of women at childbirth. The first group (n=50) underwent an emergency cesarean section following induced labor and had a mean cortisol level of 445 with a standard deviation of 65. The second group (n=55) delivered either by cesarean section or vaginally following spontaneous labor, and had a mean cortisol level of 650 with a standard deviation of 70. Construct a two-sided 95% confidence interval for the difference between the two means. Assume equal variances. You MUST show your work to receive full credit. Partial credit is available. Give the following in your answer:
1. The value for t and how you found it, 2. The calculation of the pooled variance, 3. The calculation of the Standard Error, 4. The calculation of the Margin of Error, 5. The calculation of the upper and lower limits, and 6. An interpretation of the confidence interval. Upload an image,
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