University of Phoenix Login X Discussion X zy Section 4.3 - QNT/375T: Busi X [Solved] . Critical values for x C | Chegg.com books.com/zybook/QNT_375T_56038242/chapter/4/section/3 > QNT/375T: Business Data Analytics home > 4.3: Confidence intervals for population proportions zyBooks catalog ACTIVITY 4.3.5. Excel: Confidence intervals for a proportion. Click this link to download the-spreadsheet for use in this activity. Critical values for quick reference during this activity Confidence level Critical value 0.90 2* = 1.645 0.95 2* = 1.960 0.99 z* = 2.576 434036.2056336.qx3zqy7 Start The manager of a bookstore with a coffee shop wants to know the proportion of customers that come into the store because of the coffee shop. A random sample of 75 customers was polled Use Sheet 2 of the Excel file linked above to calculate p and the 95% confidence interval. p = EX: 1.234 Upper bound for 95% confidence interval = Ex: 1.234 Lower bound for 95% confidence interval = The manager can say with 95% confidence that the true population proportion of the customers that come into the store because of the coffee shop is in the interval | Ex: 1 234 O a ? 40OF Mo