Finding and interpreting a confidence interval for a population mean (σ unknown)

Howdy! I’m Professor Curtis of Aspire Mountain Academy here with more statistics homework help. Today we’re going to learn how to find and interpret a confidence interval for a population mean when the population standard deviation is unknown. Here’s our problem statement: A clinical trial was conducted to test the Continue Reading

StatCrunch: Confidence Intervals for the Difference between Two Proportions with Summary Data

In this video you will learn to compute confidence intervals for the difference between two proportions with summary data using StatCrunch. This example comes from a Gallup survey taken in July and August 2014, which asked 945 republicans 854 democrats to name the biggest problem for the United States. The Continue Reading

StatCrunch: Computing Confidence Intervals for a Mean with Raw Data

In this video you will learn to compute one sample t confidence intervals with raw data using StatCrunch. The dataset I’m using is called “apple juice bottles”. This dataset comes from Statistics: Informed Decisions Using Data by Michael Sullivan. The “apple juice” column contains the amount in ounces it each Continue Reading