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t - Wharton Statistics
t - Wharton Statistics

Chapter 5: Statistical Inference (in General)
Chapter 5: Statistical Inference (in General)

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Confidence Intervals- take-home exam Part I. Sanchez 98-2

... 3. The times taken to complete a statistics test by all students are normally distributed with a mean of 55 minutes and a standard deviation of 9 minutes. Find the probability that the mean time taken to complete this test by a class of 36 students would be between 50 and 58 minutes. ...
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SciMethod _ Stat - Napa Valley College

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Mean Differences - NMSU College of Business

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Stat 302 Statistical Methods 1 (2) Question 1: A computer software

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402 Statistical Calculations – Frequency Table

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Introduction to Hypothesis Testing

... Null hypothesis (H0) - A statement that declares the observed difference is due to “chance.” It is the hypothesis the researcher hopes to reject. Alternative hypothesis (H1) - The opposite of the null hypothesis. The hypothesis the researcher hopes to bolster. Alpha (α) - The probability the researc ...
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Misuse of statistics

Statistics are supposed to make something easier to understand but when used in a misleading fashion can trick the casual observer into believing something other than what the data shows. That is, a misuse of statistics occurs when a statistical argument asserts a falsehood. In some cases, the misuse may be accidental. In others, it is purposeful and for the gain of the perpetrator. When the statistical reason involved is false or misapplied, this constitutes a statistical fallacy.The false statistics trap can be quite damaging to the quest for knowledge. For example, in medical science, correcting a falsehood may take decades and cost lives.Misuses can be easy to fall into. Professional scientists, even mathematicians and professional statisticians, can be fooled by even some simple methods, even if they are careful to check everything. Scientists have been known to fool themselves with statistics due to lack of knowledge of probability theory and lack of standardization of their tests.
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