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When is chi-squared not valid? Give an example of a contingency table for which the chi-squared test of independence should not be used.
Statistics and Probability, Statistics
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Two people agree to meet at a coffee shop. They each independently pick a random moment in time between 8 a.m. and 9 a.m. and show up exactly at their selected time. But they are very impatient, and only stay for 10 minu ...
Should you perform a log transformation on a categorical (nominal) variable, or can you only do that for continuous variables?
A coin is randomly picked from a collection of 10 coins, the ith coin having a probabiliity i/10 of coming up heads. The coin in then flipped repeatedly until a head appears. Let X be the number of flips necessary. Find ...
Acme Airlines flies airplanes that seat 20 passengers. From experience, they have learned that, on average, 85% of the passengers holding reservations for a particular flight actually show up for the flight. If they book ...
What percent of the measurements are found below the 30th percentile? Found above the 30th percentile? For the regression line y^ = 3x + 2 what is the best predicted value if x is 7? Assume that male and female births ar ...
A cell phone company offers 15 different voice packages and 15 different data packages. Of those, 6 packages include both voice and data. How many ways are there to choose either voice or data, but not both?
A company designs a new laptop computer and wants to investigate customers' preferences with respect to three select laptop features. The features are Price (High vs. low) Processor Speed (Low vs. medium vs. high) Weight ...
Suppose it is known that the response time of healthy subjects to a particular stimulus is a normally distributed random variable with a mean of 15 seconds and a variance of 16. What is the probability that a random samp ...
5% of females smoke cigarettes. What is the probability that the proportion of smokers in a sample of 865 females would be greater than 3%
An aerospace company has submitted bids on two separate federal government defense contracts, AandB . The company feels that it has a 60% chance of winning contract Aand a 30% chance of winning contractB . If it wins co ...
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