Critical values for quick reference during this activity. 'Ectintihse raga jztfritisal vaiiir ETE'E 251533=E :r3:q;.' 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 1 of the Excei file linked above to calculate it and the 95% condence intewai. I; = Efiss'f' Upper bound for 95% confidence interval = glip-c: 1.234 _ Lower bound for 95% confidence interval = The manager can satr 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 [gEz-z: 1.234 ,'_ ]