Posts related to my Excelsior BUS 503 Quantitative Methods course.
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 …
Setting up Hypothesis Tests – Three Useful Tables Read More »
Enter your data in the blue cells and the minimum sample size will be in the yellow cell at the bottom. Note: the standard deviation and E must be in the same units (e.g. inches, feet, etc). Download a copy of the workbook Min Sample Size for Mean CI V1.00
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 …
Minimum Sample Size Calculator for Population Proportion Confidence Interval Read More »
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 …
Find Confidence Level, C, for Population Proportion Confidence Interval Read More »
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 …
Question: A standard deck of cards contains 52 cards. One card is selected from the deck. (a)compute the probability of randomly selecting a spade or club (b)Compute the probability of randomly selecting a spade or club or heart. (c)compute the probability of randomly selecting a jack or heart. I can’t seem to know what formula to …