4. Find the area under the standard normal curve. Round to four decimal places.

a)between z = 0 and z = 1.95

b)between z = 0 and z = 2.05

c)between z = 1.15 and z = 2.37

d)from z = 1.53 to z = 2.88

e)from z = 1.67 to z = 2.24

5.The probability distribution of the population data is called the (1) ________. Table 7.2 in the text provides an example of it. The probability distribution of a sample statistic is called its (2) _________. Table 7.5 in the text provides an example it.

A.Probability distribution

B.Population distribution

C.Normal distribution

D.Sampling distribution

6. ___________ is the difference between the value of the sample statistic and the value of the corresponding population parameter, assuming that the sample is random and no non-sampling error has been made. Example 71 in the text displays sampling error. Sampling error occurs only in sample surveys.

7. Consider the following population of 10 numbers. 20 25 13 19 9 15 11 7 17 30

a)Find the population mean. Round to two decimal places.

b)Rich selected one sample of nine numbers from this population. The sample included the numbers 20, 25, 13, 9, 15, 11, 7, 17, and 30. Calculate sampling error for this sample. Round to decimal places.