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 388282.2542864.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: 1.234Come because of coffee shop 2 No 3 Yes A Yes 5 Yes 6 No 7 Yes 8 No 9 No 10 Yes 11 Yes 12 Yes 13 No 14 Yes 15 No 16 No 17 Yes 18 Yes 19 No 20 No No 22 Yes 23 No 24 Yes 25 Yes 26 Yes 27 No 28 Yes 29 Yes 30 Yes 31 Yes 32 No 33 Yes 34 No 35 Yes 36 Yes 37 Yes 38 Yes 39 Yes 40 Yes 41 Yes 42 Yes No 44 No 45 Yes 46 Yes 47 No 48 Yes 49 No 50 Yes 51 Yes 52 Yes 53 No 54 Yes55 No 56 No 57 Yes 58 Yes 59 No 60 Yes 61 Yes 62 No 63 No 64 Yes 65 Yes 66 No 67 No 68 Yes 69 Yes 70 Yes 71 Yes 72 Yes 73 Yes 74 Yes 75 No 76 No