when the conditions are met, a C% confidence interval for the unknown proportion p is where z ' is the critical value for the standard Normal curve N (0,1) with ____% of its area between ______ and Example: M rs. Lakey wondered what proportion of Katy Perry's Twitter followers are female, so she selected a random sample of 500 of Katy Perry's followers. In the sample, 308 are female. We already verified that the conditions are m et. (a) Determine the critical value 2* for a 90% confidence interval for a proportion. (b) Construct a 90% confidence interval for the proportion of all of Katy Perry's Twitter followers who are female. (c) interpret the interval from part (b). (d) Katy Perry stated that exactly half of her followers are female. Use your results from above to comment on this