Question

Suppose the population mean IQ score is 110 (σ = 4). Researchers took a sample of...

Suppose the population mean IQ score is 110 (σ = 4). Researchers took a sample of 49 adults and got a sample mean IQ score of 113. What is the test statistic after performing the appropriate test?

a.

5.26
b.

37.5
c.

+/- 1.96
d.

1.00
Math   Statistics-And-Probability   
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Answer #1

Solution :

The null and alternative hypothesis is ,

= 110

= 113

= 4

n = 49

Test statistic = z

= ( - ) / / n

= ( 113 - 110) / 4 / 49

= 5.26

correct option is = a

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