1) A bank randomly selected 247 checking account customers and found that 115 of them also had savings accounts at this same bank. Construct a 95% confidence interval for the true proportion of checking account customers who also have savings accounts. (Round your answers to three decimal places.) Lower Limit ________

Upper Limit ________

2)In a sample of 58 randomly selected students, 33 favored the amount being budgeted for next year's intramural and interscholastic sports. Construct a 90% confidence interval for the proportion of all students who support the proposed budget amount. (Give your answers correct to three decimal places.)

Lower limit _______

Upper limit_______

3)You are testing the null hypothesis p = 0.4 and will reject this hypothesis if z is less than -1.96. (Give your answers correct to four decimal places.)

(b) What is the significance level for this test? (c) What is the p-value for z = -1.94?