Find the z* values based on a standard normal distribution for each of the following. (a) A 78%% confidence interval for a proportion. Round your answer to two decimal places. +z* i eTextbook and Media Hint (b) An 82% confidence interval for a slope. Round your answer to two decimal places. : + i e Textbook and Media Hint (c) A 92 %% confidence interval for a standard deviation. Round your answer to two decimal places. +z* = + i eTextbook and Media Hint