Data Analysis Assignment 1

Instructions for STAT 250 Data Analysis Assignment 1

This assignment must be completed using the EconSurvey dataset provided on Canvas. You must not use AI to compute results or generate answers. All analysis must be done using the required statistical tools listed below.

Required tools:

• StatKey (for one-way and two-way tables)
• Rguroo (for bar charts and pie charts)
• EconSurvey.csv file from Canvas

Investigation 1 Tasks

1. Identify the cases

• Write one sentence stating who the cases are and how many cases there are (358 individuals).

1. Identify variables

• State how many variables were collected.
• Identify which variables are categorical and which are quantitative.

1. Study type

• Identify whether the data came from an observational study or a randomized experiment, with one-sentence justification.

1. StatKey one-way table: EmploymentSector

• Create a one-way table with counts and proportions
• Screenshot only the Summary Statistics table
• Paste the image into the solution document

1. List EmploymentSector values

• Write one sentence listing all categories shown in the table.

1. StatKey one-way table: SavingsRate

• Create a one-way table with counts and proportions
• Screenshot only the Summary Statistics table
• Paste the image into the solution document

1. Rguroo Pareto chart

• Create a relative frequency Pareto bar chart for EmploymentSector
• Bars must be ordered by decreasing proportion
• Y-axis must show relative frequency
• Properly title and label the graph
• Paste the graph into the document

1. Rguroo pie chart

• Create a pie chart for SavingsRate
• Labels must show percentages
• Slices ordered by decreasing value
• Proper title required
• Paste the graph into the document

1. Interpret EmploymentSector

• Identify which sector has the highest and lowest proportion
• Include the proportions in complete sentences

1. Interpret SavingsRate

• Identify which savings level has the highest and lowest proportion
• Include the proportions in complete sentences

Investigation 2 Tasks

1. StatKey two-way table

• Create a two-way table of EmploymentSector SavingsRate
• Screenshot both:
• Counts table
• Overall proportions table
• Paste both images into the document

1. Column proportions

• Generate the column proportions table
• Screenshot and paste into the document

1. Column percentage calculation

• Using the Counts table:
• Calculate the percentage of high savers who work in the public sector
• Show the calculation
• Round proportion to 4 decimals before converting to a percentage
• Write one sentence interpreting the result

1. Row proportions

• Generate the row proportions table
• Screenshot and paste into the document

1. Row percentage calculation

• Calculate the percentage of public sector workers who save at a high level
• Show calculation and interpretation

1. Grouped bar chart (EmploymentSector)

• Create a side-by-side relative frequency bar chart
• Factor 1: EmploymentSector
• Factor 2: SavingsRate
• Include legend, proper title
• Paste into document

1. Grouped bar chart (SavingsRate)

• Create a side-by-side relative frequency bar chart
• Factor 1: SavingsRate
• Factor 2: EmploymentSector
• Include legend, proper title
• Paste into document

1. Graph identification

• State which graph represents row proportions and which represents column proportions in one sentence

1. Explanatory vs response variable

• Identify explanatory and response variables in one sentence

1. Generalization

• State whether results can be generalized to the population
• Provide one-sentence justification

1. Causation

• State whether causation can be established
• Provide one-sentence justification

Formatting & Submission

• All answers must be clearly labeled by question letter
• All graphs and tables must be pasted directly from StatKey or Rguroo
• Interpretations must match the numerical results
• Follow STAT 250 conventions (concise, correct, no fluff)

Your solutions document should include the following items. Points will be deducted if the following are not included:

1. Type your Name and STAT 250 with your correct section number (e.g. STAT 250-xxx) right justified, at the top of the page.
2. Type Data Analysis Assignment #__, centered on the top of page 1 below your name to begin your solutions document.
3. Number your pages across your entire solutions document.
4. Your solutions document should include the ANSWERS ONLY, with each answer labeled by its corresponding number and subpart. Keep the answers in order.
5. Generate all requested graphs and tables using Rguroo or StatKey only.
6. A screenshot is a digital image that shows some or all of the contents of a computer display. A screenshot is created by the operating system or software running on the device powering the display. Screenshots are not pictures of your computer screen using your phone.
7. When asked for a screenshot, please only provide what is asked (not the entire screen). Lastly, make sure these screenshots are readable (the larger the better, but no bigger than half of a page).
8. Upload your solutions document as a pdf file. It is your responsibility to upload a readable file.