comparing box plots 7th grade

What two types of samples give you the best data for a population?

• Simple Random Sample

• Convenience Sample

• Voluntary Response Sample

• Systematic Response Sample

 

The data below shows the scores of two groups of ten students on a math quiz and a science quiz.            

Math: 72, 92, 88, 67, 54, 58, 64, 76, 65, 72            

Science: 84, 78, 56, 89, 54, 68, 75, 78, 84, 60

Based on the data, which statements are true?

• The median score was greater for math, but the variability was greater for science.

• The median score was greater for science, but the variability was greater for math.

• Both the median score and variability for the math scores are less than that of the science scores.

• Both the median score and variability of the math scores are greater than that of the science scores.

• The range for science is less than the range for math.

Mr. Jackson had students grow the same type of plant in two different rooms to test the growing conditions. The results are shown in the box plant. Choose ALL accurate statements below.

• Room 7G has the tallest plant.

• 75% of 7D plants are 8 in. or taller.

• 7G has a greater median height.

• Room 7D has the shortest and tallest plants.

What percentage of Airplane B flies at least 195 in.?

• 25%

• 50%

• 75%

• 100%

Maria records random speeds from three different Internet providers in the table. Which company offers the fastest mean downloading speed?

• City Net

• Able Company

• Tel-N-Net

• Imposible to determine for the representative data

If there are 180 girls in athletics, how many girls play soccer and basketball?

• 54

• 81

• 45

• 120

If 200 people were surveyed, approximately how many people like pepperoni and cheese as their topping?

• 100 people

• 150 people

• 50 people

• 75%

The range and IQR are ________in Group B as compared to Group A, so there is ________variability in the growth of plants in Group B.

• greater, less

• greater, more

Each day, Erin chooses shirts to wear from her closet at random. She has 2 blue shirts, 2 white shirts, 5 back shirts, and 3 red shirts. Since she does not replace the shirts she has worn, what is the probability that she will wear 2 black shirts in a row?

• $\frac{1}{16}$

• $\frac{5}{33}$

• $\frac{9}{132}$

• $\frac{25}{132}$

Tricia surveys students in her computer class about time spent on computers by students in her school. Is this a representative sample? Explain.

• No; Only a few students in the school take computer class.

• No; Students in computer class likely use computer more than other students.

• Yes; Students in computer class are representative of the school.

• Yes; Students in computer class are representative of people in the town