Chapter 7 Review - Confidence Intervals

When interpreting the confidence interval, make sure that you are describing the 

• statistic
• parameter

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CCSS.HSS.IC.B.4

A __________ gives an interval of plausible values for the _____________. 

• confidence interval, statistic
• point estimate, parameter
• point estimate, statistic
• confidence interval, parameter

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CCSS.HSS.IC.B.4

Complete the equation: 
point estimate +/- _____

• standard deviation
• margin of error
• critical value
• confidence level

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CCSS.HSS.IC.B.4

What is the format for interpreting a confidence interval? 

• The interval from ___ to ___ captures the true mean in context.
• C% of samples of the same size taken from the same population will capture the parameter in question
• There is convincing evidence that C% gives the interval (___, ___) capturing the parameter in question.
• We are C% confident that the interval from ___ to ___ captures the [parameter in context].

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CCSS.HSS.IC.B.4

Increasing the sample size __________ the confidence interval. 

• increases
• decreases
• does not affect
• there is not enough evidence to determine the answer

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CCSS.HSS.IC.B.4

What can you do to reduce the margin of error? 

• increase the confidence level
• decrease the confidence level
• increase sample size
• decrease sample size

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CCSS.HSS.IC.B.4

Given the interval (1.2, 1.8), what is the point estimate and the margin of error? 

• 1.5, 0.6
• 1.5, 0.3
• 1.2, 0.3
• 1.2, 0.6

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CCSS.HSS.IC.B.4

The Large Counts condition is met by using what equation? 

• n(p-hat)
• n >/ 30
• n > 10
• n(1-p-hat)

Which of the following is the definition of a "point estimate?"

• The average of a population.

• The average of a sample.

• The midpoint of a confidence interval.

• The confidence interval.

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CCSS.HSS.IC.B.4

The symbol for the sample proportion is __________.

• Z_c
• p̂
• E
• q

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CCSS.HSS.IC.B.4