Percentiles for the standard normal distribution
Find the following percentiles for the standard normal distribution. Interpolate where appropriate. (Round your answers to two decimal places.)
a) 81st
b) 19th
c) 74th
d) 27th
e) 15th
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Calculate the estimate for the standard error of difference between two independent means for s12 = 13, s22 = 20, n1 = 22, and n2 = 30. (Give your answer correct to two decimal places.)
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What is the critical value of z in the previous question? Report the critical value CLOSEST to your calculated z-score. (Answer to 2 decimal places.)
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