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Question 4 [ 0.67/1 pt ) 2-3 19 @ Details Score on last try: 0.67 of 1 pts. See Details for more. Get a similar question You can retry this question below Someone takes a simple random sample of 28 observations. From this they correctly give a 95% confidence interval for u as (16.665, 27.335). Using this information and your knowledge of the formula for confidence intervals, (assuming all conditions necessary are satisfied) find the sample mean, @ and the sample standard deviation, s, from which they calculated this confidence interval. (a) First notice that the formula for a confidence interval is 'observed _ error', so the observed value is in the middle of the interval. That means that to get the sample mean we can average the endpoints of the confidence interval, which gives us the sample mean: a = 22 (b) get the critical t-value used for a 95% confidence interval with n = 28. This gives us (rounded to 3 decimal places): t = 2.052 (c) Now using the above answers with the formula for the confidence interval, we find the sample standard deviation (rounded to 1 decimal place) to be: s = 13.7 x Submit