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The quality control officer at a plant needs to determine what percentage of items in a batch are defective. The following are different sampling techniques that could be used by the officer. Classify each as simple random sample, stratified sample, systematic sample, cluster sample, or convenience sample and explain why. Classify.
a.) The officer lists all of the batches in a given month. The number of defective items is counted in randomly selected batches.
b.) The officer takes the first 12 batches and counts the number of defective items.
c.) The officer groups the batches made in a month into which shift they are made. The number of defective items is counted in randomly selected batches in each shift.
d.) The officer divides the batches made in a month into which day they were made. Then certain days are picked and every batch made that day is counted to determine the number of defective items.
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a randomized controlled trial is run to evaluate the effectiveness of a new drug for asthma in children with the
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The UNESCO Institute for Statistics reported that the literacy rate in Zimbabwe was 88.5% for males and 84.6% for females.
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