b.What measure of central tendency is most appropriate for describing these data? Why?

5.On a standard measure of hearing ability, the mean is 300, and the standard deviation is 20. Provide the Zscores for persons whose raw scores are 340, 310, and 260. Provide the raw scores for persons whose Zscores on this test are 2.4, 1.5, and -4.5.Use the fomula z = (raw score - mean)/(standard deviation)The the formula raw score = (z score) (stand. dev) + (mean)6.Using the unit normal table, find the proportion under the standard normal curve that lies in the tail for each of the follow using table starting on page 673 (Hint: Remember to change allpercents to decimals):a.Z= 1.00 b.Z= -1.05 c.Z= 0 d.Z= 2.80 e.Z = 1.96

WEEK TWO PRACTICE WORKSHEET7

7.Suppose the scores of architects on a particular creativity test are normally distributed. Using a normal curve table (pp. 673-676 of the text), what percentage of architects have Zscoresabove .10?

8.A 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 to his lecture and pulling aside every third student to give him or her a questionnaire.

WEEK TWO PRACTICE WORKSHEET8a.Is this sample design an example of random sampling? Explain.

b.Assuming that all students attend his class that day, how many students will the instructorselect to complete his questionnaire?