All freshmen at a university are enrolled in 1 of 30 sections of a seminar course. to select a sample of freshmen at this university, a researcher selects 4 sections of the seminar course at random from the 30 sections and all students in the 4 selected sections are included in the

Cluster.

Step-by-step explanation:

In the question To select a sample of freshmen at this university, a researcher selects 4 sections of the seminar course at random from the 30 sections and all students in the 4 selected sections are included in the sample Cluster.

Cluster sampling is type of sampling method in which the researchers divide the population into separate group called clusters. Then a simple random sample is cluster is chosen from the population. And the researcher conducts his analysis on the data from the cluster sample.

Similar activity can be observed in the given case and hence it can be called as sample cluster.

both the histogram and the stem and leaf plot will visually show how many shoppers were of various ages within each range of data.   the histogram does not give us the specific ages of these shoppers unlike the stem and leaf plot.a histogram does not give us a true range of the data because we do not know exactly how old the shoppers were. a stem and leaf plot will give exact ages, so we can determine the exact range along with all measures of center and the others measures of center.   with the histogram, we cannot find any of these.

step-by-step explanation: