Author Question: The number of hours needed by sixth grade students to complete a research project was recorded with ... (Read 67 times)

ETearle · **on:** Jul 25, 2018

The number of hours needed by sixth grade students to complete a research project was recorded with the following results.

Hours Number of students (f)
4 22
5 16
6 16
7 13
8 14
9 8
10+ 5

A student is selected at random. The events A and B are defined as follows.

A = the event the student took between 6 and
9 hours inclusive
B = the event the student took at most 7 hours

Determine the number of outcomes that comprise the event (A or B).
A) 118 B) 29 C) 51 D) 89

Question 2

Several watch-dog consumer groups have criticized the fast food industry for serving food with excessive fat content. One watch-dog announced that it will randomly select one fast food chain per week.

The watch-dog will then decide, as a group, to purchase one item off the menu that has been advertised the most on television and in the newspapers. The watch-dog will then have that heavily-advertised, just-purchased item professionally sampled for fat content. Weekly results will be posted on the watch-dog's website. For this scenario, what best describes the watch-dog's sampling activities each week?
A) Multistage sampling B) Stratified sampling
C) Systematic sampling D) Cluster sampling