7th Grade Unit 10 Reg Quiz

As reported on Realtor.com, the median home prices in Tampa, Florida in October of 2020 was $209,000. Home prices in an area are commonly reported with the median as measure of center and range as measure a variability, which statement is true?

• A. Mean and interquartile range are used when there are no outliers.

• B. Median and interquartile range both need to be used when there are no outliers in the data.

• Median and interquartile range are the measure of center and variability used for data sets with outliers.

• Mean and range are good statistical data measures when the data set has an outlier.

For a STEAM project at school, Nevaeh records the daily high temperature, each day, for the month of August. The temperatures were relatively the same. Which measure of variability should she use for her data?

• Interquartile range because the high temperature has no outliers.

• Interquartile range because the high temperature has outliers.

• Range because the high temperature has no outliers.

• Range because the high temperature has outliers.

The scores for tests taken by Kesha and Robert are shown below. Each test is worth 20 points. Which statements below compare their data scores and are false statements? Select all that apply.

Kesha: 15, 18, 20, 15, 16, 19, 16

Robert: 16, 18, 16, 9, 17, 20, 20

• The median is a better representation of center than the mean for Robert’s test scores.

• Kesha has a larger range than Robert.

• The middle 50% of Robert’s scores are more consistent than the middle 50% of Kesha’s scores.

• Robert's data has an outlier.

• Kesha’s data should use the median and Robert should usethe mean to represent their data.

What comparisons can be made about the variability between first period and second period?

• 1st Period has a smaller range and larger IQR than period 2.

• 2nd Period has a smaller range and larger IQR than period 1.

• 1st Period should use IQR as its measure of variability because it has no outliers.

• 2nd Period should use range as its measure of variability because it has no outliers.

The box plots show the amount of money spent by customers at two stores.

If Store B had 240 customers, how many would you expect to spend less than $30?

• 40

• 60

• 80

• 100

The data for 125 trees in the orchard is shown in the histogram. Trees between 250-300 𝑐m in height represent what percentage of the data?

• 40 %

• 50 %

• 250 %

• 300 %

Using the data below to determine just the variability of the average temperatures in the first twelve days of the month, which data display would you use and why?

• Bar Chart to display categories.

• Line Plot since each piece of data is represented.

• Box Plot since it’s a visual display of the spread of data.

• Circle Graph to show the entire data set.

The cafeteria manager gathered the following data about what vegetables the students eating lunch in the cafeteria preferred. How would you recommend she display the data below?

10% Carrots, 15% Zucchini, 20% Tomatoes, 25% Squash, 30% Potatoes

• Box Plot

• Circle Graph

• Line Plot

• Histogram

Aidan is collecting data for his 2nd period class, he wants to display the data for the number of letters in everyone’s first name, what data display should he use and why?

• Box Plot since it shows distribution of data.

• Circle Graph since it is percent of the whole population.

• Line Plot since each piece of data represented.

• Stem-and-Leaf Plot since it has intervals.

What data display would you use for the data given in the table at the left?

• Bar Chart since each category is represented.

• Box Plot to show the spread of data.

• Circle Graph to show percentages of the whole data set.

• Histogram to show each interval of data.