Bootcamp Week 4 Review

Joey plans to survey his classmates about which presidential candidate for whom they will vote. Which group(s) of classmates should Joey poll for valid results? Select ALL that apply.

• randomly selected classmates of both genders

• randomly selected classmates in the Environmental Club

• randomly selected females in his class

• randomly selected classmates from each homeroom

Mr. Blaine wants to survey a random sample of students at his middle school about the amount of homework assigned each night. Which surveying method is the best option?

• surveying all of the school’s eighth grade students

• surveying all of the students who stay for the math bowl practice

• surveying every fourth student as they arrive to school in the morning

• surveying all of the students who play a musical instrument at the school

Blaine works for a battery manufacturing company. He wants to develop a method to test the batteries made each day to determine if they work. Which method would provide the most valid results?

• sampling the first 25 batteries made each day and testing to see if they work

• sampling the last 25 batteries made each day and testing to see if they work

• sampling the first 50 batteries made each day and testing to see if they work

• randomly sampling 50 batteries throughout the day and testing to see if they work

Which scenario would provide the least biased results?

• surveying people at a concert about their favorite bands

• surveying every 10th person who enters a mall about their favorite type of cookie

• surveying people at a sporting event about their favorite team

• surveying 6th grade students about the location of the 8th grade dance

Adam wants to observe the amounts of time the students in his middle school spend listening to music every day. For this, he surveys 40 seventh graders in his school. Is the survey sample a valid representation of the entire school, and why?

• No. Adam does not survey members of the school band.

• No. Adam does not survey students from other grades.

• Yes. Adam samples a large group and has a good representation of the school.

• Yes. Adam surveys all seventh graders.

The governor has proposed a tax increase of 0.1% to support the local school systems. The newspaper randomly selects 1,000 voters each month leading up the June election. Which statement is true?

• The tax increase will be passed because more voters polled approve it.

• The tax increase will be rejected because more voters polled disapproved of it most recently.

• The polls taken so far make it too close to call whether the tax increase will pass or not.

• Since the variation of the in the poll data is low, the tax increase will be rejected.

Two elementary schools each conducted a survey of 100 fifth grade students asking about their favorite ice cream flavors. The results of the surveys are listed in the chart. Survey Location | Chocolate | Vanilla | Strawberry | Total School #1 | 37 | 47 | 16 | 100 School #2 | 44 | 25 | 31 | 100 Which is a valid inference about the data?

• Chocolate is a more popular flavor at School #1 than it is at School #2.

• More students prefer chocolate than both vanilla and strawberry combined at School #1.

• Approximately twice as many students prefer strawberry at School #1 than at School #2.

• If both schools are combined, the most popular flavor is chocolate.

Which sentence describes the variation in the data of each group?

• The data from the Wolves shows more variation because it stretches farther to the left.

• The data from the Rams shows more variation because it stretches farther to the right.

• The data from the Wolves shows more variation because there are multiple scores that have more than 2 data points.

• The data from the Rams shows more variation because the values are more spread out, whereas the Wolves' values are more centered.

The dot plots show the heights of ten 7th grade and 9th grade students. Which statement(s) is (are) correct?

• A. ii only

• B. iii only

• C. i and ii

• D. i and iii

Use the information given to answer the question. Dot plots of two data sets are shown. Which statement is true?

• The median of Set 1 is 1 more than the median of Set 2.

• The median of Set 1 is 4 more than the median of Set 2.

• The median of Set 1 is 5 more than the median of Set 2.

• The median of Set 1 is equal to the median of Set 2.