Question

- A company that produces snack foods uses a machine to package 454 grams bags of potato chips. A random sample of 75 bags of potato chips has a mean of 450 grams and standard deviation of 8.48 grams. Perform a hypothesis test at the 1% significance level to determine if the machine is working properly.

Answer #1

Solution :

Givan that ;

= 454

= 450

= 8.48

n = 75

This is the two tailed test .

The null and alternative hypothesis is ,

H0 : = 454

Ha : 454

Test statistic = z

= ( - ) / / n

= ( 450 - 454 ) / 8.48 / 75

= -4.09

**The test statistic = -4.09**

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