Showing 12 calculators in Statistics
Mean, Median, Mode Calculator - Free Online Statistics Calculator
Calculate mean (average), median (middle value), and mode (most frequent) instantly. Includes step-by-step solutions and data visualization.
Standard Deviation Calculator - Free Online Variance & SD Calculator
Calculate standard deviation, variance, and coefficient of variation. Choose between population and sample calculations with visual distribution.
Correlation Coefficient Calculator - Free Pearson's r Calculator
Calculate Pearson correlation coefficient (r) between two variables. Includes scatter plot, regression line, and coefficient of determination (rยฒ).
Z-Score Calculator - Free Standard Score & Probability Calculator
Calculate z-scores, find probabilities, and percentile ranks. Convert between raw scores and z-scores with visual normal distribution curve.
Chi-Square Test Calculator - Free ฯยฒ Statistical Test
Perform chi-square tests for independence and goodness of fit. Calculate chi-square statistic, p-value, and visualize expected vs observed frequencies.
Confidence Interval Calculator - Free CI Calculator for Mean & Proportion
Calculate confidence intervals for population mean, proportion, and difference. Find margin of error and interpret results with visualization.
Linear Regression Calculator - Free Statistical Analysis Tool
Perform linear regression analysis. Calculate slope, intercept, R-squared, predictions, and residuals with scatter plot visualization.
T-Test Calculator - Free Statistical Hypothesis Testing
Perform one-sample, two-sample, and paired t-tests. Calculate t-statistic, p-value, confidence intervals with visual comparisons.
Sample Size Calculator - Free Statistical Sample Size Calculator
Calculate the required sample size for surveys, experiments, and research studies. Determine statistical power and confidence levels.
P-Value Calculator - Free Statistical Significance Calculator
Calculate p-values from test statistics for z-tests, t-tests, chi-square, and F-tests. Determine statistical significance easily.
Effect Size Calculator - Free Cohen's d, r, and ฮทยฒ Calculator
Calculate effect sizes including Cohen's d, Pearson's r, eta squared, and more. Essential for research and meta-analysis.
Odds Ratio Calculator - Free Case-Control Study Calculator
Calculate odds ratios with confidence intervals for case-control studies. Essential for epidemiology and medical research.
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