Measures of Distributions - AP Statistics
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Question
follows a chi-squared distribution with 
degrees of freedom and 
through 
are independent standard normal variables.
If 
, what is 
?
If
Answer
Use the fact that the sum of 
squared standard and independent normal variables follows a chi-squared distribution with 
degrees of freedom.
Use the fact that the sum of
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Question
The purpose of the t test is to do which of the following?
The purpose of the t test is to do which of the following?
Answer
A t test is used to compare the means of different groups. A t test score describes the likelihood that the difference in means between two groups is due to chance. The null hypothesis assumes the two sets are equal however, one can reject the null hypothesis with a p value within a particular confidence level.
A t test is used to compare the means of different groups. A t test score describes the likelihood that the difference in means between two groups is due to chance. The null hypothesis assumes the two sets are equal however, one can reject the null hypothesis with a p value within a particular confidence level.
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