Question

(d) subscribers to a new smart phone app that streams songs were assigned numbers. then a sample of 30 subscribers was selected by using a random - number table. the subscribers in the sample were invited to rate the process for selecting the songs in the playlist.
simple random sample
stratified sample
systematic sample
cluster sample
convenience sample
(e) to judge the appeal of a proposed television sitcom, a random sample of 10 people from each of three different age categories was selected and those chosen were asked to rate a pilot show.
simple random sample
stratified sample
systematic sample
cluster sample
convenience sample

Explanation:

(d) Subscribers are numbered and selected via random - number table, which is simple random sampling. (e) Population is divided by age categories and samples are taken from each, which is stratified sampling.

Answer:

(d) simple random sample
(e) stratified sample