TEKS.MATH.9-12.VI.C.1

To test a claim about a mean, when the population standard deviation is unknown we use:

• z procedures
• Pythagorean Theorem
• t procedures
• np > 10 and n(1-p) > 10

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TEKS.MATH.9-12.VI.C.1

When conducting a significance test for the difference in proportions, why do we pool the data when finding standard error?

• Because we like to swim

• Because we assume p1 = p2 in Ho

• Because the sample sizes are always equal

• To be safe and make sure we don't underestimate the standard error

• Because we don't the standard deviation.

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TEKS.MATH.9-12.VI.C.1

Ms. Hernandez began her math class by saying:
I'm thinking of 5 numbers such that their mean is equal to their median. If 4 of the numbers are 14, 8, 16, and 14, what is the 5th number?What is the 5th number Ms. Hernandez is thinking of?

• 14
• 15
• 16
• 18

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TEKS.MATH.9-12.VI.C.1

r=0.3

• Strong positive 
• Weak positive
• Strong negative
• Weak negative 

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TEKS.MATH.9-12.VI.C.1

Mrs. Collins made a scatterplot to show the relationship between the number of absences and a student’s final exam score. Based on this scatterplot, a student with 6 absences should get approximately what score on the final exam?

• 65

• 92

• 70

• 76

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TEKS.MATH.9-12.VI.C.1

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

Lillian’s test grades during the past five weeks were 90, 97, 100, 100, 92. What grade will she need to get on this week’s test in order to have an average of 95?

• 85

• 91

• 97

• 98

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TEKS.MATH.9-12.VI.C.1

Phil collected data from several of his friends about the number of hours they spent sleeping and the number of hours they spent playing video games on Saturday. He recorded the data in the scatterplot. Based on the scatterplot, what is the best prediction of the number of hours one of Phil's friends spends sleeping when the friend spends 1 hour playing video games?

• 9 hours

• 10 hours

• 7 hours

• 8 hours

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TEKS.MATH.9-12.VI.C.1

A mayor is concerned about the percentage of city residents who express disapproval of his job performance. His political committee pays for a newspaper ad, hoping to keep his disapproval rating below 21%. They will use a follow up poll to access effectiveness. What are the correct null and alternative hypotheses?

• Ho: μ > 21

  Ha: μ < 21

• Ho: p > .20

  Ha: p < .20

• Ho: p < .21

  Ha: p > .21

• Ho: p > .21

  Ha: p < .21

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TEKS.MATH.9-12.VI.C.1

How do we reduce variability?

• Increase randomness.

• Increase sample size.

• Decrease randomness.

• Decrease sample size.

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TEKS.MATH.9-12.VI.C.1

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

Correlation coefficient is the statistic that measures the strength and direction of a linear association between two quantitative variables.

• True

• False

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TEKS.MATH.9-12.VI.C.1

TEKS.MATH.9-12.VI.C

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