Question: How do you get answer from the following calculation below: z test statistic < -1.28 The test statistic is calculated as: Z test statistic =

How do you get answer from the following calculation below:

z test statistic < -1.28

The test statistic is calculated as:

Z test statistic =

Where,

0 = 22

= 6

n = 220

Sample mean = 21.63181818 (calculated from given data)

Therefore,

Z test statistic = -0.9102

Critical value = -1.28

Furthermore, test statistic > critical value.

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