AP Statistics: Descriptive Statistics flashcards

Question 1

Which part of the data does a box plot picture?

Accepted Answer

The middle 50% of the data.

Question 2

What is the first quartile of a data set?

Accepted Answer

The median of the bottom half of the data once it is put in order.

Question 3

What is the frequency of a data value?

Accepted Answer

The number of times that value occurs in the data.

Question 4

What does a frequency table display?

Accepted Answer

Grouped data together with the matching frequencies.

Question 5

On a histogram, what do the x-axis and y-axis show?

Accepted Answer

x shows the data; y shows the frequency or relative frequency.

Question 6

What shape are the bars of a histogram?

Accepted Answer

Contiguous (touching) rectangles.

Question 7

How is the interquartile range (IQR) found?

Accepted Answer

IQR = third quartile - first quartile.

Question 8

What range of the data does the IQR cover?

Accepted Answer

The central 50 percent of the values.

Question 9

What is the formula for a sample mean?

Accepted Answer

Sum of all values in the sample divided by the number of values in the sample.

Question 10

What symbol denotes a population mean?

Accepted Answer

μ (mu).

Question 11

What symbol denotes a sample mean?

Accepted Answer

x-bar (x with a bar over it).

Question 12

'Mean' is short for what term?

Accepted Answer

Arithmetic mean.

Question 13

What does the median do to ordered data?

Accepted Answer

Splits it into halves: half the values are at or below it, half at or above it.

Question 14

Must the median be one of the data values?

Accepted Answer

No; it need not be one of the data values.

Question 15

What is the mode of a data set?

Accepted Answer

The value that occurs most often.

Question 16

Into how many parts do percentiles divide ordered data?

Accepted Answer

Hundredths (100 parts).

Question 17

Which percentile is the median?

Accepted Answer

The 50th percentile.

Question 18

Which percentiles are the first and third quartiles?

Accepted Answer

The 25th and the 75th percentiles.

Question 19

Which quartile is the median?

Accepted Answer

The second quartile.

Question 20

What is relative frequency?

Accepted Answer

The number of times a value occurs divided by the total number of outcomes.

Question 21

If the smaller data values are more spread out, which way is the data skewed?

Accepted Answer

To the left.

Question 22

If the larger data values are more spread out, which way is the data skewed?

Accepted Answer

To the right.

Question 23

How is the standard deviation related to the variance?

Accepted Answer

The standard deviation is the square root of the variance.

Question 24

Which symbols denote sample and population standard deviation?

Accepted Answer

s for a sample; σ (sigma) for a population.

Question 25

What is the variance in terms of deviations?

Accepted Answer

The average of the squared deviations from the mean.

Question 26

For a sample, what is the deviation of a data value x?

Accepted Answer

x - x-bar, where x-bar is the sample mean.

Question 27

When computing sample variance, what do you divide the sum of squared deviations by?

Accepted Answer

n - 1, the sample size minus one.

AP Statistics: Descriptive Statistics flashcards

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