CCSS.Math.Content.HSS.IC.B.4

What percentage of girls have blonde hair?

• 30%
• 32%
• 29%
• 40%

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CCSS.Math.Content.HSS.IC.B.4

What does this symbol represent?

• population proportion
• parameter
• sample proportion
• population sample

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CCSS.Math.Content.HSS.IC.B.4

Identify the confidence interval used in the figure below if each shaded area is equal to 0.05.

• 90%
• 95%
• 98%
• 99%

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CCSS.Math.Content.HSS.IC.B.4

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.Math.Content.HSS.IC.B.4

A preliminary study suggests that 87% of people agree on an issue. How large must your sample size be so you could be within ± 3% of p calculate at 90% confidence?

• 7

• 466

• 5

• 338

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CCSS.Math.Content.HSS.IC.B.4

Two random samples, A and B, were selected from the same population to estimate the population mean. For each sample, the mean, standard deviation, and margin of error for a 95 percent confidence interval for the population mean are shown in the table. Which of the following could explain why the margin of error of sample A is greater than the margin of error of sample B?

• The sample size of A is greater than the sample size of B.

• The sample size of A is less than the sample size of B.

• The sample size of A is equal to the sample size of B.

• The mean of sample A is greater than the mean of sample B.

• The standard deviation of sample A is less than the standard deviation of sample B.

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CCSS.Math.Content.HSS.IC.B.4

The parameter is a number describing the:

• population

• sample

• survey

• percent

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CCSS.Math.Content.HSS.IC.B.4

What type of Sampling?

You are interested in finding out the percent of residents in the city that have experienced a robbery in the past year. Using the city property records, you assign each residence a number. You use a random number generator to give you a list of numbers. You contact the residence that corresponds to that number to ask your questions.

• Random

• Stratefied

• Systematic

• Cluster

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CCSS.Math.Content.HSS.IC.B.4

Identify the correct null hypothesis:

Is the proportion of babies born male different from 50%? In a sample of 200 babies, 96 were male. Test the claim using a level of significance of 1%.

• H₀: p = 0.50

• H₀: µ = 100

• H₀: p = 0.48

• H₀: µ = 96

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CCSS.Math.Content.HSS.IC.B.4

In a random sample of 1000 adult Americans, only 430 could name at least one justice who is currently serving on the US Supreme Court. A claim is that fewer than half of adult Americans can name at least one justice who is currently serving on the US Supreme Court. State the null hypothesis.

• H_o: p <.5, where p is the true proportion of Americans who can name one justice currently serving.

• H_o:p >.5 where p is the true proportion of Americans who can name one justice currently serving.

• H_o:p =.5 where p is the true proportion of Americans who can name one justice currently serving.

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CCSS.Math.Content.HSS.IC.B.4