Amanufacturer of chocolate chips would like to know whether its bag filling machine works correctly at the 418 gram setting. it is believed that the machine is underfilling the bags. a 9 bag sample had a mean of 411 grams with a standard deviation of 20 . a level of significance of 0.025 will be used. assume the population distribution is approximately normal. is there sufficient evidence to support the claim that the bags are underfilled?

There is sufficient evidence to support the claim that the bags are under-filled.

Step-by-step explanation:

Since we have given that

Sample mean = 411

Standard deviation = 20

n = 9

So, the test statistic value is given by

At 0.025 level of significance,

critical value z = -2.306

since -2.306<-1.05

so, we will reject the null hypothesis.

Yes, there is sufficient evidence to support the claim that the bags are underfilled.

i am not sure :

step-by-step explanation: