Find the approximate perimeter of polygon DINGO plotted below. Round your final answer to the nearest hundredth.
units
7
4
2
-7-6-5-4-3-2
+
1 2 3 4 5 6 7
3
o
31
2 of 9​

Arandom sample of n = 25 observations is taken from a n(µ, σ ) population. a 95% confidence interval for µ was calculated to be (42.16, 57.84). the researcher feels that this interval is too wide. you want to reduce the interval to a width at most 12 units. a) for a confidence level of 95%, calculate the smallest sample size needed. b) for a sample size fixed at n = 25, calculate the largest confidence level 100(1 − α)% needed.