Wk 3 - Practice: Wk 3 Exercise [due Day 5] i Saved 10 Find a confidence interval for / assuming that each sample is from a normal population. (Round the value of t to 3 decimal places and your final answers to 2 decimal places.) 3 (a) a = 24, s= 3, n= 7, 90 percent confidence. points eBook The 90% confidence interval is from to Hint References (b) I = 42, s = 6, n= 18, 99 percent confidence The 99% confidence interval is from to (c) I = 119, s = 14, n = 28, 95 percent confidence