AP Stats

At a particular college, 78% of all students are receiving some kind of financial aid. The school newspaper selects a random sample of 200 students and 72% of the respondents say they are receiving some sort of financial aid. Which of the following is true?

• 78% is a population and 72% is a sample.

• 72% is a population and 78% is a sample.

• 78% is a parameter and 72% is a statistic.

• 72% is a parameter and 78% is a statistic.

A statistic is an unbiased estimator of a parameter when

• the statistic is calculated from a random sample.

• in a single sample, the value of the statistic is equal to the value of the parameter.

• in many samples, the values of the statistic are very close to the value of the parameter.

• in many samples, the values of the statistic are centered at the value of the parameter.

• in many samples, the distribution of the statistic has a shape that is approximately normal

In a residential neighborhood, the distribution of house values is unimodal and skewed to the right, with a median of $200,000 and an IQR of $100,000. For which of the following sample sizes is the sample median most likely to be above $250,000?

• n = 10

• n = 50

• n = 100

• n = 1000

Increasing the sample size of an opinion poll will reduce the

• bias of the estimates made fro the data collected in the poll

• variability of the estimates made from the data collected in the poll

• effect of nonresponse of the poll

• variability of opinions in the sample

• variability of opinions in the population

The math department at a small school has 5 teachers. The ages of these teachers are 23, 34, 37, 42, and 58. Suppose you select a random sample of 4 teachers and calculate the sample minimum age.

Which of the following shows the sampling distribution of the sample minimum age?

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Classify each of the specified numbers as a parameter or a statistic.

There have been 44 Presidents of the United States, and 36% of them were Democrats. The 36% here is a...

• Statistic

• Parameter

• Sample

• Population

Classify each of the specified numbers as a parameter or a statistic.

There have been 44 Presidents of the United States, and 36% of them were Democrats. The 44 is a...

• Statistic

• Parameter

• Sample

• Population

In a 2011 Gallup poll of 1008 adults living in the United States, 11% said they are satisfied with the condition of the national economy. The 11% here is a

• Sample

• Population

• Statistic

• Parameter

In a 2011 Gallup poll of 1008 adults living in the United States, 11% said they are satisfied with the condition of the national economy. The 1008 is a

• Sample

• Population

• Statistic

• Parameter

The data from all 36 students in Ms. Dunham's second grade class have a mean height of 64 inches with a standard deviation of 1.3 inches. The 1.3 inches is a

• Sample

• Population

• Statistic

• Parameter