AP Stats Chapter 8

Quiz by Corey Klein

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10 questions

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- Q1What type of graph is used to show the relationship between two quantitative varialbesscatterplot120s
- Q2The correlation r for the data in this scatterplot isnear 1near -.5near 0near -1120s
- Q3In the scatterplot , if each x-value were decreased by one unit and the y-values remained the same, then the correlation r wouldremain the sameincrease slightlyyou cannot telldecrease slightly120s
- Q4In regression, the residuals are which of the following?possible models unexplored by the investigatorthe difference between the observed responses and the values predicted by the regression linethose data points which were recorded after the formal investigation was completedthose factors unexplained by the data120s
- Q5What does the square of the correlation measure?the strength of the linear association between the variablesthe slope of the LSRLthe intercept of the LSRLthe percent of the variation in the values of y that is explained by the variation in the values of x120s
- Q6Which of the following statements are true? I. Correlation and regression require explanatory and response variables. II. Scatterplots require that both variables be quantitative. III. Every LSRL passes through the mean of x and yI, II, and IIII, and III onlyII and III onlyI and II only120s
- Q7A local community college announces the correlation between college entrance exam grades and scholastic achievement was found to be -1.08. On the basis of this, you would tell the college thatthe college should hire a new statistician.the exam is a poor predictor of success.students who do best on this exam will be poor students.students at this school are underachieving.120s
- Q8120s
- Q9Suppose we fit the LSRL to a set of data. What is true if a plot of the residuals shows a curved pattern?Outliers must be present.A straight line is not a good model for the data.LSRL is a good fit.The correlation must be positive.120s
- Q10The following is / are resistant to drastic, unusual data:correlation coefficientneither the least squares line nor the correlation coefficientboth the least squares line and the correlation coefficientleast squares line120s