Question

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

Answer 1

this is the left tailed test .  

he null and alternative hypothesis is ,

H₀ :   = 32

H_a : < 32

Test statistic = z

= ( - ) / / n

= (31.4-32) / 1.5/ 40

=-2.53