TEKS.MATH.9-12.VI.C.2

A company test marketed an item at different prices in a region of the country.  The scatterplot above shows the item prices and the profit made by the company when the item sold at different item prices.  A quadratic model that best fits the data is also shown.  For a price of $60, which of the following best approximates the percent increase from the test market profit to the profit that the model predicts? 

• 50%
• 75%
• 100%
• 200%

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TEKS.MATH.9-12.VI.C.2

What is the correlation?

• Negative correlation
• No correlation
• Positive correlation
• All of the above

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TEKS.MATH.9-12.VI.C.2

The table shows five used car prices for a luxury sedan taken from used car dealerships in North Carolina.  Based on the line of best fit for the data, which price might you expect for the model sedan if it were 54 months old?

• $10,450
• $14,545
• $16,537
• $18,600

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TEKS.MATH.9-12.VI.C.2

The stem-and-leaf diagram below gives the distribution of the ages in years of 20 participants at a family reunion. Which of the following statements about the distribution is correct?

• The first quartile is larger than the third quartile.
• The distribution is strongly skewed to the left.
• It makes the most sense to use the mean and standard deviation as a numerical summary of the center and spread of this distribution.
• The mean is larger than the median.

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TEKS.MATH.9-12.VI.C.2

Based on the scatterplot, which of the following conclusions about the relationship between her height and weight is true?

• There is a negative relationship between height and weight

• There is a positive relationship between height and weight

• There is a constant relationship between height and weight

• There is no relationship between height and weight

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TEKS.MATH.9-12.VI.C.2

Estimate the correlation coefficient for this scatterplot.

• A) r = 1.2

• B) r = 0.89

• C)r = 0

• D) r = -0.89

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TEKS.MATH.9-12.VI.C.2

Describe the relationship between the variables.

• A) Weak positive correlation

• B) Weak negative correlation

• C) Strong positive correlation

• D) Strong negative correlation

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TEKS.MATH.9-12.VI.C.2

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

• A) The more books students read, the lower their English grade.

• B) The more books students read, the higher their English grade.

• C) The fewer books students read, the higher their English grade.

• D) No relationship exists between the number of books students read and their English grades.

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TEKS.MATH.9-12.VI.C.2

The following dot plot is

• skewed left

• skewed right

• symmetrical

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TEKS.MATH.9-12.VI.C.2

What was the height of the water at 3 seconds?

• 9 feet

• 10 feet

• 7 feet

• 5 feet

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TEKS.MATH.9-12.VI.C.2