(Solution) - Identify the type of sampling random stratified systematic cluster convenience -(2025 Original AI-Free Solution)

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Identify the type of sampling (random, stratified, systematic, cluster, convenience) used in each of the following.
a. A sample of products is obtained by selecting every 100th item on the assembly line.
b. Random numbers generated by a computer are used to select serial numbers of cars to be chosen for sample testing.
c. An auto parts supplier obtains a sample of all items from each of .12 different randomly selected retail stores.
d. A car maker conducts a marketing study involving test drives performed by a sample of 10 men and 10 women in each of 4 different age brackets.
e. A car maker conducts a marketing study by interviewing potential customers who request test drives at a local dealership.