Inferences

Front

Is the inference "4 out of 5 doctors prefer Brand X medicine" valid based on a survey of 5 doctor friends?

Back

No, because the doctors asked are not a representative sample of the population of doctors.

Front

Whose inference is more reliable when surveying novel preferences: Shantel's systematic sampling (21% prefer romance) or Syrus's convenience sampling (48% prefer romance)?

Back

Shantel

Front

Maria collects data from a random sample of 7th graders in her school and finds that 16 out of 20 7th graders participate in after-school activities. How many students should Maria expect to participate in after-school activities if 240 total 7th graders attend Maria's school?

Back

192

Front

A movie theater randomly samples the types of admission tickets sold on Friday in the afternoon and the evening. If 400 tickets are sold on a Friday afternoon, use your inference and proportional reasoning skills to determine how many of those 400 tickets would be adult tickets.

Back

80

Front

Trinity asked a random sample of 50 students if they brought lunch from home today. If 30 answered “yes,” about what percent of students at Trinity’s school brought lunch from home today?

Back

60%

Front

Best sampling method to estimate mean word count per page in a 180-page book? Options: Count the words on one randomly chosen page; Calculate the mean word count for a sample consisting of the pages with pictures; Calculate the mean word count for a sample of 20 pages selected by choosing every 9th page; Calculate the mean word count for a sample consisting of the 10 pages that appear to have the most words.

Back

Calculate the mean word count for a sample of 20 pages selected by choosing every 9th page.

Front

Predict the number of purple jellybeans in a bag of 200 total jellybeans if a random sample of 25 resulted in 4 purple jellybeans.

Back

32

Front

If there are 230 students in the school, and all of them vote, what is Michael’s best estimate of the number of students who would vote for Johanna?

Back

161 students

Front

Which size random sample is likely to provide the most trustworthy results?

Back

30