Statistical Study With Parameters

The ________ is the totality of the observations with which we are concerned.

• Population

• Sample

What is the definition of interquartile range (IQR)?

• The interquartile range is the sum of the first quartile and the third quartile in a dataset.

• The interquartile range is the median of a dataset.

• The interquartile range is the difference between the first quartile and the third quartile in a dataset.

• The interquartile range is the difference between the maximum and minimum values in a dataset.

What is the definition of mode?

• The mode is the median value in a dataset.

• The mode is the value that appears least frequently in a dataset.

• The mode is the average of all the values in a dataset.

• The mode is the value that appears most frequently in a dataset.

Which of the following are parameters? Select all that apply.

• 75% of the students at North High School voted for Lucy

• The total collected at a fundraiser was $5, 281

• The mean height of students at one table in the cafeteria is 1.3 m.

• Ten out of 25 random people surveyed chose "red."

Which of the following represent a statistic? Choose all that apply.

• A biology teacher finds that 56% of students preferred labs to tests when polling 25 randomly selected students.

• A teacher surveys all of his students and finds that 87% enjoy group work.

• Forty randomly selected members of a high school music program were asked to report the number of hours they spend practicing each week.

• A company looks at all of the bags of almonds they produced in a year and finds that the average number of almonds per bag was 18.

What is the shape of the distribution?

• Skewed Left

• Skewed Right

• Symmetric

• Uniform

The list below shows the most recent test scores for students in Mr. Garcia’s study group.

78, 90, 94, 72, 80, 68, 72, 88, 94, 98, 86, 96

Which box-and-whisker plot correctly represents the data in the list?

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Specific characteristics of a population are called

• data

• statistics

• parameters

• samples

In a Gallup poll of 1236 adults, 9% said that bad luck happens on Friday the 13th. The 9% is 

• a sample statistic

• a parameter

• the raw data

• a confidence interval

A survey reveals that 12% of Americans believe Elvis is still alive, with a margin of error of 4 percentage points.  The confidence interval for this poll is

• From 10% to 14%

• From 4% to 20%

• From 8% to 16%

• From 11.6% to 12.4%