stats

T or F: Observational studies can determine causation and correlation

• True

• False

Answer explanation

Observational studies CANNOT determine causation, only correlation

A(n) ___ study is a study in which an investigator manipulates one of the variables and tries to determine how the manipulation affects the other variable(s)

• observational

• causational

• manipulative

• experimental

Two most common graphs for categorical data

• Histogram

  Pie Chart

• Pie Chart

  Tree Diagram

• Bar Graphs

  Pie Chart

• Histogram

  Tree Diagram

Describe the spread of the histogram.

• symmetrical

• right skew

  negative

• left skew

  negative

• right skew

  positive

Answer explanation

a left skewed histogram is when the histogram appears to be a little emptier on the left side and it has a negative relationship

Describe the spread of the histogram.

• right skew

  negative

• symmetrical/ bell shaped

• left skew

  positive

• right skew

  positive

Answer explanation

right skewed histograms are those that appear to be a little emptier on the right side and have a positive relationship

Identify the outlier(s), if any.

• Item 1

• Item 12

• Item 5

• Item 3

T or F: dot plots are useful for identifying outliers and comparing distributions

• True

• False

T or F: dot plots give you different values such as median, IQR, upper quartile, etc.

• True

• False

describe the shape of the histogram. (right skew/ left skew & positive/negative)

Answer explanation

Answer: right - skew & positive

Describe the histogram ( left skew/ right skew & positive / negative)

Answer explanation

Answer: left skew & negative