A manufacturer of banana chips would like to know whether its bag filling machine works correctly at the 430 gram setting. It is believed that the machine is underfilling the bags. A 32 bag sample had a mean of 420 grams with a variance of 784. Assume the population is normally distributed. A level of significance of 0.05 will be used. Specify the type of hypothesis test.
A. Left-Tailed Test
B. Right-Tailed Test
C. Two-Tailed Test
Solution :
This is left tailed test .
The null and alternative hypothesis is ,
H0 :
= 430
Ha :
< 430
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