Does polling work? (Yes)

does-polling-work.ts

const US_ADULT_POPULATION = 245e6;
const populationSize = US_ADULT_POPULATION;

const defaultSampleSize = 15000;

type Individual = number;
type Population = Individual[];
type Sample = Individual[];

main();

function main(): void {
  const population = createPopulation(populationSize);
  const sample = takeSample(population, defaultSampleSize);
  const sampleMean = average(sample);
  const populationMean = average(population);
  console.log(`Sample mean: ${sampleMean}`);
  console.log(`Population mean: ${populationMean}`);
}

/**
 * Creates a population size with a random distribution.
 */
function createPopulation(populationSize: number): Population {
  return Array.from({ length: populationSize }, () => Math.random());
}

/**
 * Takes a sample of the provided population.
 */
function takeSample(population: Population, sampleSize: number = defaultSampleSize): Sample {
  return population.sort(() => Math.random() - 0.5).slice(0, sampleSize);
}

/**
 * Calculates the mean of a sample.
 */
function average(sample: number[]) {
  return sample.reduce((acc, curr) => acc + curr) / sample.length;
}