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DCAT Preparation > STATISTICS > Flashcards

STATISTICS Flashcards

1
Q

Basically the average and represented by the symbol x bar

A

MEAN

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2
Q

How to calculate the Mean?

A

Take the sum of the set of numbers divided by to the numbers that are in the data set

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3
Q

Basically the middle number or simply the middle number of data set?

A

MEDIAN

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4
Q

How to find Median?

A

Eliminate the first and the last number then the next numbers until left with the middle number

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5
Q

What to do if you come accross a situation where you dont have one number in the middle (example 2 numbers)?

A

Take the average of those two middle numbers. Add them up then divide by 2.

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6
Q

Simply the most frequent number in the data set?

A

MODE

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7
Q

A data set with two modes is called what?

A

Binomial data set

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8
Q

What do you call a data set with only one mode?

A

Unimodal

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9
Q

The difference between the highest number and the lowest number

A

RANGE

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10
Q

What is the first step to find the mean, median, mode, and range?

A

Arrange the numbers in increasing orders

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11
Q

A statistical term that describes a division of observations into four defined intervals based on the values of the data and how they compare to the entire set of observations.

A

Quartile

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12
Q

The difference between the upper and lower quartile values in a set of data. (Q3 - Q1)

A

Interquartile range

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13
Q

It is commonly referred to as IQR and is used as a measure of spread and variability in a data set.

A

Interquartile range

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14
Q

Median of the lower half of the data set

A

1st Quartile (Q1)

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15
Q

Basically the median of the entire data set

A

2nd Quartile (Q2)

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16
Q

Median of the upper half of the data set

A

3rd Quartile (Q3)

17
Q

A single data point that goes far outside the average value of a group of statistics

A

Outlier

18
Q

Also known as box plot. Summarizing a set of data.

A

Box and Whisker Plot

19
Q

Shows how the data is distributed and it also shows any outliers.

A

Box and Whisker Plot

20
Q

Useful way to compare different sets of dara as you can draw more than one boxplot per graph.

A

Box and Whisker Plot

21
Q

Measurement of the distortion of symmetrical distribution or asymmetry in a data set. Demonstrate bell curve.

A

Skewness

22
Q

If you have a data that is perfectly symmetrical, the mean is gonna be _______ to the median

A

Equal

23
Q

The box and whisker plot is evenly distributed

A

Represents a symmetric distribution

24
Q

If the tail of the graph is in the right side. Sample mean will be in the right. Mean will be greater than the median. Some referred as a Positive Skew.

A

Skewed to the right

25
Q

The box and whisker plot : right side of the box is longer than the left side. Even if the box is equal, the right side line longer than the left side. Q3 - Q2 > Q2 - Q1

A

Skewed to the right

26
Q

If the tail of the graph is in the left side. Sample mean will be in the left of the median. Mean is less than the median. Also known as Negative Skew.

A

Skewed to the left

27
Q

Q2 will be closer to Q3 in the box plot. Left side line is longer than the right side. Q2 - Q1 > Q3 - Q2

A

Skewed to the left

28
Q

The Mode in this is the number with the most dots. Visually groups the number of data points in a data set based on the value of each point.

A

Dot Plot

29
Q

Gives a visual depiction of the distribution of the data, similar to a histogram or probability distribution function.

A

Dot Plot

30
Q

A type of plot with 2 columns ( left=stem, right=leaf) and may have decimal values. Technique used to classify either discrete or continuous variables.

A

Stem and Leaf Plot

31
Q

2 columns where the left is a value with an accompanying frequency on the right. A “t-chart” or two-column table which outlines the various possible outcomes and the associated frequencies observed in a sample.

A

Frequency table

32
Q

Similar to bar graph yet bars are interconnecting. The height of a rectangle (the vertical axis) represents the distribution frequency of a variable (the amount, or how often that variable appears).

A

Histogram

33
Q

frequency divided by n

A

Relative frequency

DCAT Preparation (5 decks)

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