Random and Simple Random: Determine whether the sampling method is random, simpl
ID: 3255298 • Letter: R
Question
Random and Simple Random: Determine whether the sampling method is random, simple random or neither. In a group of 100 males and 200 females, 40 participants are selected for a survey: 20 males and 20 females. In a group of 100 males and 100 females, 40 participants are selected for a survey: 20 males and 20 females. Student ID numbers are put into a computer and 20 of these students are randomly selected for a survey. There are 10 bags of spinach per coming from Green Acres spinach company. The health box inspector wants to sample 40 bags of spinach. She randomly selects 4 boxes from the 100 boxes being shipped that day and tests each bag in the selected boxes for the presence of the bacteria E. coli. Sampling Methods: Identify the type of sampling used: systematic, convenience, stratified, or cluster, or none of them. Then comment on whether the sample is random or not. The commissioner randomly selects 2 teams from all 30 MLB teams and has everyone on that team drug tested. At a border crossing, every 15th car is searched. I randomly select 10 male and 10 female students to be in a survey on whether or not they like my statistics class. In a survey about a given movie, a surveyor stands at the exit and interviews people as they come out of the theater. When one survey is completed the surveyor picks the next person coming out of the theater. A quality assurance person randomly selects one coming off the production line and tests all of box of CD's the CD's in that book for defects. In a survey of TV viewing preferences 100 people are chosen from the age brackets of 15-20, 21-25, 26-30, ellipsisExplanation / Answer
(a) Random and not Simple random. REASON: Probability of selection of each member of the sample is not the same.
(b) Random and Simple random. REASON: Probability of selection of each member of the sample is the same.
(c) Random and Simple random. REASON: Probability of selection of each member of the sample is the same.
(d) Random and not Simple random. REASON: The selection invoves 2 stages: Stage 1: selection of 4 boxes from 100 boxes. Stage 2: Select all 10 bags from all the 4 boxes selected.
9.
(a) Cluster sampling. Here 2 clusters are selected from 30 clusterts
(b) Systematic sampling: Here every 15th item is selected.
(c) Stratified sampling: here the 2 strata are: male students and female students.
(d) Convenience sampling: No statistical method is used here in selection of sample.
(e) None of them. Here one box is selected and all items in that box are selected.
(f) Stratified sampling: here strata are age groups: 15-20, 21-25, 26-30
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