95 Confidence Interval Sample Size 30. StatKey was used to construct a 95 confidence interval using the percentile method. Since the sample size is large we can use the formula that employs the Z-score.
P -196 z 196095. Therefore the Confidence Interval at a 90 confidence level is 322 to 338. Jun 10 2019 Z is the chosen Z-value 196 for 95 s is the standard error.
Sample mean margin of error 095.
Says that 95 of experiments like we just did will include the true mean but 5 wont. Find the T value. So the 95 confidence interval is -141 -107. A 95 confidence interval for the percentage of US.
