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ConfidenceIntervals.js
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ConfidenceIntervals.js
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function calculateConfidenceInterval() {
event.preventDefault(); // Prevent form submission
// Get input values
var meanInput = document.getElementById('mean');
var stdDevInput = document.getElementById('stdDev');
var sampleSizeInput = document.getElementById('sampleSize');
var confidenceLevelInput = document.getElementById('confidenceLevel');
var mean = parseFloat(meanInput.value);
var stdDev = parseFloat(stdDevInput.value);
var sampleSize = parseFloat(sampleSizeInput.value);
var confidenceLevel = parseFloat(confidenceLevelInput.value);
// Calculate confidence interval
var marginOfError = calculateMarginOfError(stdDev, sampleSize, confidenceLevel);
var lowerBound = mean - marginOfError;
var upperBound = mean + marginOfError;
// Display result
var resultDiv = document.getElementById('result');
resultDiv.innerHTML = 'Confidence Interval: ' + lowerBound.toFixed(2) + ' to ' + upperBound.toFixed(2);
}
function calculateMarginOfError(stdDev, sampleSize, confidenceLevel) {
// Calculate critical value based on confidence level
var zScore;
if (confidenceLevel === 0.90) {
zScore = 1.645;
} else if (confidenceLevel === 0.95) {
zScore = 1.96;
} else if (confidenceLevel === 0.99) {
zScore = 2.576;
} else {
alert('Invalid confidence level.');
return;
}
// Calculate margin of error
var marginOfError = zScore * (stdDev / Math.sqrt(sampleSize));
return marginOfError;
}
// FORMULA
function showPopup() {
var popup = document.getElementById('popup');
popup.style.display = 'block';
}
function closePopup() {
var popup = document.getElementById('popup');
popup.style.display = 'none';
}