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Lecture No.2 Inference For Two Population Mean The pooled t test
Lecture No.2 Inference For Two Population Mean The pooled t test

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... (b) Does your interval provide convincing evidence that there is a difference in the mean capacity between the two stores? Since the interval includes 0, it is plausible that there is no difference in the two means. Thus, we do not have convincing evidence that there is a difference in mean capacity ...
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Week 1: Descriptive Statistics

... When we summarize a data set in a frequency distribution, we are approximating the data set by "rounding" each value in a given class to the class mark. n 1 n x   fi xi   pi xi n i 1 i 1 where fi  the frequency of the ith observation and ...
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Chapter 10 Notes: Hypothesis Tests for two Population Parameters

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Trying to find critical value for test statistics of 2

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Student's t-test

A t-test is any statistical hypothesis test in which the test statistic follows a Student's t-distribution if the null hypothesis is supported. It can be used to determine if two sets of data are significantly different from each other, and is most commonly applied when the test statistic would follow a normal distribution if the value of a scaling term in the test statistic were known. When the scaling term is unknown and is replaced by an estimate based on the data, the test statistic (under certain conditions) follows a Student's t distribution.
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