Observational Study Project: Data Analysis

Create a written report on your observational study including the following:

Variables and Data

___ Collect data for at least 30 observational units

___ Explain how data was collected (include list or partial list of population if applicable)

___ Define all variables and indicate the type of variable for each

___ Provide a print out of the data as entered into Statcruch

Calculations for measures of center

___ Explain the procedure for locating the median

___ Determine the median of each measurement variable

___ Explain the procedure for calculating the mean

___ Calculate the mean for each measurement variable

Calculations for measures of spread

___ Explain the procedure for computing the five-number summary. Compute the five-number summary for each measurement variable ___ Calculate the IQR. Explain the procedure for calculating the IQR and explain what this tells you about a data set.

___ Calculate the standard deviation for each measurement variable.

___ Explain the procedure for calculating the standard deviation and what this number tells you about a data set Distributions of Single Variables

___ Create bar graphs for categorical variables

___ Write a sentence summarizing each bar graph

___ Create dotplots, stemplots, and histograms for each quantitative variable

___ Write a paragraph describing the key features (center, spread, shape, and outliers) for each quantitative variable

Comparing Categorical Variables

___ Create a two-way table for comparing the distributions of categorical variables. (If you only have one categorical variable, you will first need to divide one of your quantitative variables into categories.)

___ Create a segmented bar graphs for the pair of categorical variables

___ Write a paragraph describing the relationship between the categorical variables

Comparing Quantitative Variables

___ Create a back-to-back stemplot for each quantitative variable comparing different categories of one of the categorical variables.

___ Create a side-by-side boxplot for each measurement variable comparing different categories of one of the categorical variables.

____ Write a paragraph comparing the distributions for each quantitative variable