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A Chip Company claims that there is 32 oz in every bag of chips with a...

A Chip Company claims that there is 32 oz in every bag of chips with a specified population standard deviation of 1.5. A sample of 40 bags where weighted with an sample mean of 31.4. A consumer feels that this less than what the company claims.

Compute the test statistic accurate to two decimals

Math   Statistics-And-Probability   
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Answer #1

this is the left tailed test .  

he null and alternative hypothesis is ,

H0 :   = 32

Ha : < 32

Test statistic = z

= ( - ) / / n

= (31.4-32) / 1.5/ 40

=-2.53

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