MATH MOD Unit 4 - Quiz 2

How much did the five 9th-grade students who chose pizza spend in all?

$310

How much did all eight 9th-grade students spend in all?

$364

What was the average amount spent by 9th-grade students?

$45.50

What was the average amount spent by these 14 students?

$46.57

What was the average amount spent by 10th-grade students?

$48

How much did the three 9th-grade students who chose fruit spend in all?

$54

Note: The researcher reported that he administered the survey to 9th- and 10th-grade friends of his that he was able to contact by telephone on a Saturday afternoon. Was this a random sampling method? Why or why not?

No; The researcher only surveyed those friends who were available by phone on Saturday.

Note: The researcher reported that he administered the survey to 9th- and 10th-grade friends of his that he was able to contact by telephone on a Saturday afternoon. Was the survey biased? Why or why not?

Yes; The researcher only surveyed his friends.

Why did we choose our method of ____________? What was the ___________ of our data collection? Did we employ __________________ sampling methods? Were our survey questions ___________?

data collection focus random unbiased

1.A(n) __________ would be a good choice for a bulletin board in a public building.visual display 2.Giving a(n) __________ would be a good choice for a presentation at a meeting.oral report 3.The choice of presentation method is partly based on the __________ of the presentation.purpose 4.When giving an oral report, a bibliography is __________.necessary 5.If a visual display is chosen to present research, a bibliography is ________.necessary 6.Charts and graphs are ______ in a written report.necessary 7.The researcher's opinions are __________ in a presentation.

visual display oral report purpose necessary necessary necessary not included