# Using the unit normal table find the proportion under

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7Using the unit normal table, find the proportion under the standard normal curve that liesto the right of each of the following:( equation: P (z>k) = 1-P (z< k) )az = 1.00P (z>1),P (z>1) = 1-P (z<1)Z table= P (z<1) = .8413Required probability = 1-.8413 = 0.1587bz = -1.05P (z>-1.05) = 1-P (z<-1.05)Z table = P (z<-1.05) = .146859Required probability = 1-.146859 = 0.85314cz = 0P (z>0) = 1-P (z<0)Z table = p-value is 0.5.
8Suppose that the scores of architects on a particular creativity test are normally distributed. Using a normal curve table (page 477-480), what percentage of architects have Zscores:aAbove .10?
Chapter 69A statistics instructor wants to measure the effectiveness of his teaching skills in a class of 102 students (N =102). He selects students by waiting at the door to the classroom prior tohis lecture and pulling aside every third student to give him/her a questionnaire. aIs this sample design an example of random sampling? Explain.
bAssuming that all students attend his class that day, how many students will he select to complete his questionnaire?
10Suppose that you were going to conduct a survey of visitors to your campus. You want the survey to be as representative as possible.aHow would you select the people to survey?
Why would that be your best method?
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