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Activity 4.5 — Survey Analyzer

Introduction

Activity 4.5

Analyzing Real-World Data

Topics

Collecting user input
Storing survey data in arrays
Processing data with traversal
Summarizing results

Why Analyze Data?

Many real programs don’t just store information — they analyze it.

Surveys, fitness apps, and recommendation systems all rely on processing collections of data.

The Survey Question

In this activity, your program analyzes responses to the question:

“How many hours of sleep did you get last night?”

Processing Pattern Review

Most data-processing programs follow this pattern:

Collect values into a list
Traverse the list
Update one or more accumulator variables
Use the results to produce output

Demo: Calculating an Average

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// Survey data example
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let responses = [6, 7, 5, 8, 6];
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// Processing pattern
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let total = 0;
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let i = 0;
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while (i < responses.length) {
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  total += responses[i];
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  i++;
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}
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let average = total / responses.length;
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console.log("Average:", average);

Demo: Counting Below a Threshold

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// Counting values that meet a condition
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let belowSeven = 0;
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let i = 0;
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while (i < responses.length) {
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  if (responses[i] < 7) {
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    belowSeven++;
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  }
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  i++;
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}
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console.log("Below 7 hours:", belowSeven);

Why This Matters

This pattern appears directly in the Create Performance Task
Simple programs can still analyze meaningful data
Clear logic is more important than complexity

'F' → Fullscreen

Objectives

Collect user input and store it in an array.
Use traversal to process survey data.
Calculate averages from numeric lists.
Count values that meet a condition.

Activity Tasks

Create a new project named survey-analyzer.
Complete each task individually.

Task 1: Collect Survey Data

Use prompt() to collect responses.
Store each response using push().
Stop collecting data when the user types done.

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console.log("--- Demo 1: Collect Survey Data ---");
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let responses = [];
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let input = "";
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while (input != "done") {
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  input = prompt("Enter hours of sleep (or type 'done'):");
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  if (input != "done") {
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    responses.push(parseInt(input));
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  }
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}
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console.log("Responses collected:", responses.length);
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prompt("Press enter to continue...");

Task 2: Analyze Results

Calculate the average hours of sleep.
Count how many responses are below 7 hours.
Print a clear summary of the results.

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console.log("--- Demo 2: Survey Analyzer ---");
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// Sample data (use your collected data here)
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let responses = [6, 7, 5, 8, 6, 4, 9];
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// Step 1: Calculate total and average
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let total = 0;
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let i = 0;
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while (i < responses.length) {
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  total += responses[i];
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  i++;
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}
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let average = total / responses.length;
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// Step 2: Count responses below 7 hours
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let belowSeven = 0;
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i = 0;
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while (i < responses.length) {
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  if (responses[i] < 7) {
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    belowSeven++;
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  }
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  i++;
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}
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// Step 3: Output results
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console.log("Number of responses:", responses.length);
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console.log("Average hours of sleep:", average);
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console.log("Students below 7 hours:", belowSeven);
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prompt("Press enter to continue...");

Sample Output

--- Demo 1: Collect Survey Data ---
Enter hours of sleep (or type 'done'): 6
Enter hours of sleep (or type 'done'): 7
Enter hours of sleep (or type 'done'): 5
Enter hours of sleep (or type 'done'): 8
Enter hours of sleep (or type 'done'): done
Responses collected: 4
Press enter to continue... [Enter]

--- Demo 2: Survey Analyzer ---
Number of responses: 7
Average hours of sleep: 6.43
Students below 7 hours: 4
Press enter to continue... [Enter]

Reflection Questions

You may write your reflection answers as comments at the bottom of your code.

Why is traversal necessary to calculate an average?
What role do accumulator variables play in data processing?
How does this program demonstrate meaningful data analysis?

Submission

Submit your activity and reflection answers to the appropriate dropbox.