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31 Cards in this Set

  • Front
  • Back

What are the two main types of Data?

Quantitative


•Qualitative

What are the Levels of Measurement?

•Nominal level


•Ordinal level


•Interval level


•Ratio level

Is Qualitative Data numeric or non-numeric?

Can be either

Is Quantitative Data Numeric or Non-numeric?

Can only be Numeric

What is Nominal Data?

Qualitative


No fixed order


Just used to distinguish one thing from another

What is Ordinal Data?

Qualitative


Same as Nominal Data, but with the ability to rank/order values

What is Ratio Data?

Quantitative


Speed, weight, height, currency, temperature

What is Interval Data?

Quantitative


Nothing exists at zero


At a stop sign, your speed should be zero

What is Descriptive Statistics?

Displaying information you've collected

What is Inferential Statistics?

The process of estimating what's happening in the population based on the sample

What is Frequency Distribution?

Amount within each category

What is the difference between a Histogram and a Bar Graph?

On a Histogram, the bars are touching

What are the Two types of Mean?

Population Mean


Sample Mean

What is the Mode?

The most frequent number(s) in the set

What is Range?

Range = Highest Value in set - Lowest Value in set

If the Median is larger than the Mean, how is distribution skewed?

Distribution is left-skewed

If the Mean is larger than the Median, how is distribution skewed?

Distribution is right-skewed

How do you do Measures of Location?

If you arrange in ascending order, what is the shape of the distribution.

How do you calculate Percentile?

1. Arrange numbers in ascending order


2. Find index i


3. If "i" is whole number, take the average of "i"th and (i+1)th. Otherwise, round up.

What is the Five # Summary?

Put into ascending order.


1. Find the minimum #. (First number in the set)


2. 25th percentile (Q1). i=(25/100)(n)


3. Median-> 50th percentile (Q2). i=(50/100)(n)


4. 75th percentile (Q3). i=(75/100)(n)


5. Maximum # in the set. (Last number in the set)

How do you calculate Inter Quartile Range (IQR)?

=Q3 - Q1

How do you calculate Lower Limit?

=Q1 - (1.5)(IQR)

How do you calculate Upper Limit?

=Q3 + (1.5)(IQR)

Probablity

0 - Will not happen


1 - Will happen

What is an Event?

One or More of Outcomes of an experiment

What is a Simple Event?

Only One Outcome is possible

What is Classical Probability?

Am equal chance for all outcomes. (Flipping a coin or rolling a die)

What is Empirical Probability?

The use of historical data to determine chances

What is Subjective Probability?

Opinion based by "experts," varies from person to person.

Rules of Probability (1)

0 -> 1, cannot be less than 0, cannot be greater than 1.

Rules of Probability (2)

Sum of probability of all outcomes must Equal 1.