Business Statistics

Chapter 10 | Statistical Inference: Hypothesis Testing for Single Populations 313

Figure 10.5

Acceptance and rejection

regions for one-tailed (left)

test ( = 0.05)

Figure 10.6

Acceptance and rejection

regions for one-tailed (right)

test ( = 0.05)

A one-tailed (left) alternative hypothesis (population mean is less than 150) can be exhibited as

below

H

1

:  < 150

(Left-tailed test)

A one-tailed (right) alternative hypothesis (population mean is more than 150) can be exhibited

as below

H

0

:  > 150

(Right-tailed test)

Table 10.2 shows a summary of certain values at various signicance levels for test statistic z.

10.5 TYPE I AND TYPE II ERRORS ...