REALS STATS TEST #1

What is the definition for “Field of Statistics”

The theory of decision making.

What is the definition for simple random sample

Every sample of size n has equal chance of being selected

What is the definition for systematic sampling

You pick a random place to start and sample evert kth amount.

What is the definition for Cluster Sampling

Break the population into clusters then pick 1 or more clusters and sample entire cluster

What is the definition for Stratified Sampling

Break the population into strata and sample from each.

What is the definition for Convenience sampling

Easy to obtain

What is the definition for parameter

Describes the population

What is the definition for statistic

Describes the sample

What is the definition for Qualitative data

descriptive, non-numerical information that captures qualities

What is the definition for Quantitative data

formation that can be counted or measured and expressed using numbers

What is the definition for Discrete data

Can be counted, “how many # of __” Whole numbers

What is the definition for Continous Data

Something that is measured

What is the notation for sample mean

x̄ ( x-bar)

What is the notation for population mean

μ

What the mean robust?

no

Is the mean a center/Location or spread

center/Location

What is the notation for median?

Q2 or P50

Is the median robust?

Yes

Is the median a center/location or spread

center/location

What is the notation for mode

Mo

What is mode robust?

Yes

Is the mode a center/ location or spread?

center/location

What is the notation for Max?

Xn

Is the max robust?

no

Is the max a center/location or spread?

center/location

What is the notation for min?

X1

Is the min robust?

no

Is the min center/loaction or spread?

center/loaction

What is the notation for percentile?

P

Is percentile robust?

yes

Is percentile spread or center/location?

center/location

What is the notation for range?

(xn-x1)

Is range the measure of center/loaction or spread?

spread

Is the range robust?

no

What is the notation for population variance

σ²

Is population variance center/location or spread?

spread

Is population variance robust?

no

What is the notation for sample variance ?

s²

Is sample variance robust?

no

Is sample variance center/loaction or spread?

Spread

What is the notation for population standard deviation?

σ

Is population standard deviation robust?

no

Is population standard deviation center/location or spread?

spread

What is the notation for sample standard deviation?

s (lowercase)

is sample standard deviation robust?

no

is sample standard deviation spread or center/loaction

spread

What is IQR

(Q3-Q1)

Is IQR center/loaction or spread

spread

is IQR robust?

yes

What is the definition of Z-score

The number of standard deviations away from the mean

What are the two ways to indenifty outliers?

Range-Rule-Of-Thumbs and IQR method

What is the IQR method for indenfity outliers?

x < Q1 - 1.5(Q3-Q1)
x > Q3 + 1.5(Q3-Q1)

What is the Range-Rule-Of Thumbs formula to identity outliers?

x̄ + or - 2(s)

What is a Stem- and leaf plot?

A stem-and-leaf plot is a data display that organizes numerical information by splitting each number into two parts: a stem (the first digit or digits) and a leaf (the final digit).

What is the Empirical Rule?

The Empirical Rule describes how data is distributed in a normal (bell-shaped) distribution around the mean:

• 68% of data is within 1 standard deviation of the mean: ±1σ

• 95% of data is within 2 standard deviations of the mean: ±2σ

• 99.7% of data is within 3 standard deviations of the mean: ±3σ

What are the 5 points of a box’s and whiskers plot?

The five points of a box and whisker plot are the minimum, first quartile (Q1), median (Q2), third quartile (Q3), and maximum.