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[DOC File]Comparing Two Population Means (matched pairs and ...
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A random sample of 19 days showed that Brand II had mean daily sales = $2285 with sample standard deviation = $440. Assume sales follow an approximately normal distribution. Find a 90% confidence interval for the population mean difference in sales .
standard deviation calculator

[DOCX File]Hypothesis Testing
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When the sample size is less than 30 and/or the population standard deviation is unknown, the t-distribution is used instead of the standard normal distribution. The t-distribution is a family of probability distributions; each separate t-distribution is determined by a parameter called the degrees of freedom (df).
when to use sample or population variance

[DOC File]Probability
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E.g., Population mean, Population Standard Deviation, Population Median, Proportion of population of registered voters voting for Bush, Population correlation between Systolic & Diastolic BP. Statistic: A summary characteristic of a sample. Any of the above computed from a sample taken from the population.
sample vs population variance

[DOC File]Suppose you always reject the null hypothesis, regardless ...
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Answer Population standard deviation is unknown and the sample size is small, calculate the t statistic . Given that t score = –1.79 and the degrees of freedom is n – 1 = 14, one would reject H0 if = 0.05 but will not reject H0 if = 0.025. Hence the p-value must be between 0.025 and 0.05.
when to use standard deviation

[DOC File]Standard deviation - 物理學系
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1.2 Estimating population standard deviation from sample standard deviation. In the real world, finding the standard deviation of an entire population is unrealistic except in certain cases, such as standardized testing, where every member of a population is sampled.
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Standard deviation sample vs population