oscms- 2. A sample of 45 women is taken and their mean height is found to be 64.3 inches with a standard deviation of 3.2 inches. Find the 90% confidence interval. 3. Would the 99% confidence interval be wider or narrower? 4. Would the confidence interval for a sample of 250 people be wider or narrower? the key is or 50% 5. 1500 Americans were asked if they thought the country was headed in the right direction, and 45% of respondents in that poll responded "yes". What is the 95% confidence interval for this result? dates by