Stats Quiz #1

What is the 5 number summary?

min, q1, q2, q3, max

What does the box in the box plot contain?

the middle 50% of data

What is the interquartile range?

q3-q1

What is considered an inner fence outlier?

upper: q3 + 1.5(IQR)

lower: q1 - 1.5(IQR)

What is considered an outer fence outlier?

upper: q3 + 3(IQR)

lower: q1 - 3(IQR)

How many boxplots can the calculator hold?

3 at a time

What must you include in a stem and leaf plot?

A title and a key

How many stems are appropriate per chart?

4-7 stems

What are the three features of distribution?

center, shape, and gaps/outliers

center/shape

• symmetric - normal, unimodal, symmetric, bell

• bimodal - may be an underlying variable

• skewed - may have an upper or lower limit

• uniform - maybe random; may have a lower or upper limit

gaps/outliers

observation that falls outside the pattern of the data

What do you do when you have too many data points?

split them! either by 0-4 and 5-9 or 0-1, 2-3, 4-5, 6-7, 8-9

What is Statsistics?

the science of collecting, organizing, and interpreting data

What is statsitics?

numbers derived from the data

What’s the difference between data and datum?

data are plural; datum is singular

What are data?

Information systematically recorded with #s or labels with a context

Who

What population is being measured? Whole or part?

What

The variables that were measured

When

When was the study done?

Where

Where did the measurements take place?

Why

Why was the study performed?

How

How were data measured? Was it representative or biased?

What are the kinds of variables?

• Quantitative - continuous (m, s, km) or discrete (# of ladybugs)

• Categorical - ordered (ordinal or grades) or unordered (like/dislike)