Question

A manufacturer of banana chips would like to know whether its bag filling machine works correctly at the 435 gram setting. It is believed that the machine is underfilling the bags. A 51 bag sample had a mean of 428 grams with a standard deviation of 25. Assume the population is normally distributed. A level of significance of 0.05 will be used. Specify the type of hypothesis test.

Left-Tailed Test

Right-Tailed Test

Two-Tailed Test

Answer 1

here as we are checking if machine is underfilling ; which means that mean is lower than stated. therefore test statistic should lie on left tail

hence Left-Tailed Test

( below are the detail of test if required)

(reject Ho)