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It is reported† that the average or mean number of Facebook friends is 155. Suppose that...

It is reported† that the average or mean number of Facebook friends is 155. Suppose that when 50 randomly chosen Facebook users are polled regarding the number of their friends, the average number of their friends was reported to be

x = 148

with a standard deviation of

s = 29.5.

Calculate the value of the z-statistic based on the sample mean, x. (Round your answer to two decimal places.)

z =

math   Statistics-And-Probability   
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Answer #1

solution

Test statistic = z

= ( - ) / / n

= (148-155) / 29.5 / 50

Test statistic = -1.68

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