Critical values for quick reference during this activity. Confidence level | Critical value 0.90 2* = 1.645 0.95 2* = 1.960 0.99 * = 2.576 456778.3069692.qx3zqy7 Jump to level 1 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 3 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