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What does "level of proof" mean? (Alpha in hypothesis testing.)
What is the technical definition of alpha?
When might a "high level of proof" be required in business?
Why does a "high level of proof" mean a small value of alpha?
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
For any distribution the score that separates the highest 10% from the rest of scores is called.
The athletic director claims that the atendance is the same as last year. What is the test value needed to evaluate the claim?
The mean age of adult learners in a chosen class of 31 students is 33.8 years. The standard deviation is equal to 7 years.
Test the claim at alpha-.05 that the average wage has not changed by finding the p-value for the test.
Explain the difference between a discrete and a continuous random variable. Give two examples of each type of random variable.
Use alpha level. 05 to compute and interpret Pearson's r and to test whether it is important (using all your steps for hypothesis test).
The table below lists the number of audience impressions (in hundreds of millions) listening to songs and the corresponding numbers of albums sold (in hundreds of thousands).
An advertising agency has been hired by a manufacturer of pens to develop an aqdvertising campaign for the upcoming holiday season. To prepare for this project, the research director decides to initiate a study of the effect of advertising on pro..
Many people believe that criminals who plead guilty tend to get lighter sentences than those who are convicted in trials. The accompanying table summarizes randomly selected sample data for San Francisco defendants in burglary cases. All of the su..
The probability of accepting a lot that is 10% defective is .677. Does that mean, then, that the probability of rejecting the lot is 0.333?
Calculate correlation coefficient for these sample data.
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