Math 240

CHALLENGE ACTIVITY 7.2.1; Confidence intervals for population proportions. Critical values for quick reference during this activity. Confidence level Critical value 0.90 z* = 1.645 0.95 z* - 1.960 0.99 2 - 2.576 V Jump to level 1 V In a poll of 1000 randomly selected voters in a local election, 471 voters were 2 against fire department bond measures 3 What is the 90% confidence interval? [ Ex: 0 123 #) Ex: 0. 123 1 [smaller value larger value]