BUS 503

Posts related to my Excelsior BUS 503 Quantitative Methods course.

Setting up Hypothesis Tests – Three Useful Tables

Step 1: Words to Symbols Table Read the problem carefully, looking for key phrases and words which will identify the claim. Look for those key phrases in the table below to determine if the claim is the null or alternative hypotheses. It can be either. Because the null and alternative must be complements, finding one will …

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Minimum Sample Size Calculator for Population Proportion Confidence Interval

If you are conducting a survey, you will need to decide on the number of people you need to sample. That, of course, depends upon how confident you want to be and how accurately you want to predict the population proportion based on your survey results. If you want to be 95% confident, that is …

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Find Confidence Level, C, for Population Proportion Confidence Interval

Although we normally start with the confidence level, C, we want for our confidence interval, sometimes you need to work backwards from the margin of error, E, and find the confidence level, In this problem, you are given some summary data about a survey and asked you to find the confidence level and the confidence …

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Basic Probabilities Excel Calculator

Students often are given questions that require them to find basic and conditional probabilities for a 2×2 matrix such as this problem: You can work this problem using StatCrunch using the Stat>Tables>Contingency path, but some students get confused by the cluttered output. I have developed an Excel worksheet that makes this much easier for a …

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