Question

(b) In a certain factory there
are two different processes of manufacturing the same
item. The average weight in a sample of 250 items produced from one process is
founded to be 120 kilograms with a standard deviation of 12 kilograms, the
corresponding figures in a sample of 400 items from the other process are 124
kilograms and 4 kilograms respectively. Compute the standard error of difference
between the two sample means'. You are required to test weather there is a
significant difference between two 'sample means'. Apply 99% confidence limit.​

Answer 1

Answer:

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