NCSCOS Grade 8 Math - Topic: Statistics and Probability
Quiz by NCDPI
Grade 8
Mathematics
North Carolina Standard Course of Study
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Measures 4 skills from
Grade 8
Mathematics
North Carolina Standard Course of Study
NC.8.SP.1
Construct and interpret scatter plots for bivariate measurement data to investigate patterns of association between two quantities. Investigate and describe patterns such as clustering, outliers, positive or negative association, linear association, and nonlinear association.
NC.8.SP.3
Use the equation of a linear model to solve problems in the context of bivariate quantitative data, interpreting the slope and 𝑦-intercept.
NC.8.SP.2
Model the relationship between bivariate quantitative data to: • Informally fit a straight line for a scatter plot that suggests a linear association. • Informally assess the model fit by judging the closeness of the data points to the line.
NC.8.SP.4
Understand that patterns of association can also be seen in bivariate categorical data by displaying frequencies and relative frequencies in a two-way table. • Construct and interpret a two-way table summarizing data on two categorical variables collected from the same subjects. • Use relative frequencies calculated for rows or columns to describe possible association between the two variables.
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Q 1/7
Score 0
Susan recorded the time she ate dinner and the number of calories she consumed during dinner for six consecutive days. The results are shown in the table.
Which BEST describes the association between the time Susan ate dinner and the number of calories she consumed?
(*NO CALCULATOR*)
60
almost none
negative
positive
irrational
7 questions
Q.Susan recorded the time she ate dinner and the number of calories she consumed during dinner for six consecutive days. The results are shown in the table.
Which BEST describes the association between the time Susan ate dinner and the number of calories she consumed?
(*NO CALCULATOR*)
1
60 sec
NC.8.SP.1
Q.Mr. Jones determined that the equation y=98−516x could be used to predict his students' unit test scores, based on the number of days, x, a student was absent during the unit. What is the meaning of the y-intercept of the function?
(*NO CALCULATOR*)
2
60 sec
NC.8.SP.3
Q.The value in dollars, y, of a car x years after it was purchased can be modeled by the function y=14,000−875x. What is the meaning of the y-intercept of the linear model?
3
60 sec
NC.8.SP.3
Q.Which equation BEST models the data shown in the scatterplot below?
4
60 sec
NC.8.SP.2
Q.The scatterplot shows the amount of sunlight some tomato plants received and the amount each plant grew.
What is the meaning of the slope of the trend line shown on the scatterplot?
5
60 sec
NC.8.SP.3
Q.A group of students were asked if they are in the Math Club and if they are in the Literature Club. Partial results are shown in the table.
∙ Of the students in the Math Club, 67% (rounded) are not in the Literature Club.
∙ Of the students not in the Math Club, 78% (rounded) are not in the Literature Club.
What is the value of x+y?
6
60 sec
NC.8.SP.4
Q.Henry made the scatterplot shown.
The scatterplot shows the data points, and it also shows the linear model that Henry drew. Which statement BEST describes the linear model?