Math 8 U8 Post Assessment Review

The following scatter plot compares the number of books sold by an independent publishing company (y) over the span of 10 weeks (x). Which linear equation best models this relationship?

• y = 25x + 250

• y = 50x + 250

• y = 0.08x + 250

• y = 12.5x + 250

Which statement best describes the given scatter plot?

• The scatter plot displays a linear relationship because the line of best fit will have a positive slope.

• The scatter plot displays a positive correlation between the variables because the points show a clear pattern of relationship and a positive slope.

• The scatter plot displays a negative correlation between the variables because the points show no clear pattern of relationship.

• The scatter plot displays no correlation between the variables because the points show no clear pattern of relationship.

The average amount of electricity consumed by a household in a day is strongly correlated to the average daily temperature for that day. This relationship is given by y = 0.46x + 6.17 where x is the temperature in °F and y is the amount of electricity consumed in kilowatt-hours (kWh). Which is the best interpretation of the slope in this situation?

• the increase energy consumption for every increase in temperature

• the average increase in temperature

• the average electricity consumption

• the decrease in electricity consumption

Mr Erepol recorded the frequency of tardiness of 10 students from Math 8 class and compared it with the score they got in the end of grade testing for Math.

Which statement is true about Mr Erepol's findings?

• The number of absences and average final grade have a positive linear association.

• The number of absences and average final grade have a negative linear association.

• There is no association between the number of absences and the average final grade.

• An association cannot be determined from the data given.

The given table compares the wait time in an auto-repair shop and the amount of time that the customer spent talking to the assigned mechanic.

Based on this table, which association best describes the relationship between the wait time and the time spent with the mechanic?

• There is no association.

• There is a positive association.

• There is a negative association.

• It is impossible to tell the association based on the data.

The cost (C) of a special Valentine's chocolate package depends on the number of chocolates, x, included in its customized box. The equation C = 3.5 + 0.75x is used to describe this situation.

Which of the following is the most fitting interpretation in of the number 3.5 in the equation?

• the total value of the box and the chocolates

• the price of one chocolate

• the price of the customized box

• the price of 5 chocolates

Students at a middle school were surveyed about their favorite season. Respondents were also categorized based on the grade level they belong in.

What is the relative frequency of students who prefer winter? Express your percent as a whole number.

• 35%

• 5%

• 20%

• 22%

Mrs Tuff made an informal survey with her Block 1 Students about their favorite Unit in Math. The students were also categorized as male and female. The resulting data is displayed as a two-way table.

About what percent of the female students chose Unit 6 as their favorite?

• 15%
• 31%

• 50%

• 62%

An 8th Grade Campus Journalist surveyed selected students from Seventy-First Classical Middle School (SFCMS) and Lewis Chapel Middle (LCM) about the team they supported during the last Superbowl.

What can be concluded about the data he concluded?

• The SFCMS students prefer the 49ers over the Chiefs.

• There were more respondents from LCM than SFCMS.

• The LCM students prefer the Chiefs over the 49ers.

• The SFCMS students prefer the Chiefs over the 49ers.

Mrs Parchment asked her students about the number of languages that they are able to speak. Respondents were also classified based on their proficiency level in a Reading Test.

Approximately what percent of the Level 4 students spoke 2 languages?

• 24%

• 10%

• 40%

• 15%