hi this is my question:
A glass blower has made 8 wine glasses, 32 ornaments and 7 bottles in one day. he is going to check the quality of the items by looking at a 20% sample.
A) Explain why he should use a straified sample rather than a random sample?
i know using stratified sampling would work but i don't know why i would use it instead of random sampling? so could someone explain this to me please?