Condence level Critical value .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 le linked above to calculate in? and the 95% condence interval. 15 = x: 1.234 Upper bound for 95% condence interval = Ex: \"1.234 Lower bound for 95% condence interval = The manager can sav with 95% condence 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 , ]