Statistics and 7.G.5 Study Guide

The heights of five ambrosia plants, in inches, selected at random from a park with 50 ambrosia plants are shown below:

78, 118, 157, 39, 98

Which is a reasonable prediction of the mean height of all the ambrosia plants in the park?

• 9.8 inches

• 39 inches

• 98 inches

• 157 inches

Tags

CCSS.7.SP.A.2

Which scenario would provide the least biased results?

• surveying people at a dog show about their favorite pet

• surveying every 10th person who enters a mall about their favorite candy

• surveying people at a sporting event about their favorite team

• surveying 6th grade students about the location for the 7th grade end of year party

Answer explanation

"Bias" means that the data is skewed towards one group or another. It's another way to say "not random."

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Sawyer wants to find the average number of words per page in his textbook. Which sampling method should Sawyer use?

• Choose the table of contents page, and count the number of words.

• Choose the last page in the book, and count the number of lines.

• Randomly choose a page in the book, and count the number of words on that page.

• Randomly choose a page in the book, and count the number on lines on that page.

Tags

CCSS.7.SP.A.2

Joey plans to survey his classmates about which presidential candidate they want to vote for. Which group(s) of classmates should Joey poll for valid results?

Select ALL that apply.

• randomly selected classmates of all genders

• randomly selected classmates in the Environmental Club

• randomly selected female classmates

• randomly selected classmates from each homeroom

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Jenna conducts a survey among 20 students in her class to find their favorite sports. The table lists the results of her survey.

Which inference could be made from Jenna's survey?

• Fewer students like basketball than baseball

• Football is the most popular of the favorite sports

• Ice hockey is the favorite sport of most students

• More students like ice hockey than basketball

Tags

CCSS.7.SP.A.2

Two random samples of 100 Americans were surveyed about their favorite television programs.

What can be inferred from the data?

• A total of 25 Americans prefer dramas

• More Americans prefer comedy than dramas

• More Americans prefer sports than comedy and drama combined.

• 47% of Americans prefer comedy

Tags

CCSS.7.SP.A.2

Lance surveyed his class to see how many students have pets. The results are shown in the table.

Which statement is true?

• Over 1/2 of the students own a dog

• About 12% of students do not own a dog

• About 1/4 of students own a hamster

• About 20% of students own either a hamster or a fish

Tags

CCSS.6.RP.A.3C

Donald and Nina each took five math tests. The table shows the grades for each test.

What is the difference in Nina's mean score and Donald's mean score?

• 10

• 12

• 34

• 50

A doctor randomly samples male and female weights for a study. The results of the doctor's study are shown.

Based on the data, which statement about male and female weights is true?

• The range of female weights is 20 pounds greater than the range of male weights, but the mean of females and males are the same.

• The range of male weights is 20 pounds greater than the range of female weights, but the mean weights of males and females are the same.

• The mean weight of males is 20 pounds greater than the mean weight of females, but the range of weights of males and females is the same.

• The mean weight of females is 20 pounds greater than the mean weight of males, but the range of weights of females and males is the same.

How much higher is Capital City's median high temperature than Springfield's median high temperature?

• 8.5 degrees

• 9 degrees

• 9.5 degrees

• 10 degrees