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Lectures for January 18 and 20 -- review
Lectures for January 18 and 20 -- review

Sample mean: M. Population mean: μ. μ is pronounced `mew,` like
Sample mean: M. Population mean: μ. μ is pronounced `mew,` like

... means will also be normally distributed. If the population is not normally distributed, but is not so horrible that it doesn’t have a mean or has infinite variability, then the distribution of sample means will become normal as the sample size becomes large. (How large is ‘large’ is a question for w ...
08-30 lecture
08-30 lecture

Document
Document

... population proportions p1 and p2 based on samples from each population. We can use the ztest if the following conditions are true: ...
Does bread lose its vitamins when stored? Small loaves of bread
Does bread lose its vitamins when stored? Small loaves of bread

Two-proportion z
Two-proportion z

Nonparametric tests on location
Nonparametric tests on location

KFUPM Faculty List
KFUPM Faculty List

... selling price. Suppose that one analyst believes that the mean difference between selling asking price and selling price for homes in a particular market area is less than $2,000. To test this using an alpha level equal to 0.05, a random sample of n = 15 homes that have sold recently was selected. T ...
Ch. 9 Notes
Ch. 9 Notes

Document
Document

population - Penn State Department of Statistics
population - Penn State Department of Statistics

Chapter 24: Hypothesis Tests for the Difference of Two Means
Chapter 24: Hypothesis Tests for the Difference of Two Means

Chapter 5
Chapter 5

The sampling distribution for ¯x1 − ¯x2 We assume that we have a
The sampling distribution for ¯x1 − ¯x2 We assume that we have a

Statistics Class 21
Statistics Class 21

Ch. 9 Notes – Confidence Interval Estimates for the Difference
Ch. 9 Notes – Confidence Interval Estimates for the Difference

Document
Document

Document
Document

z Tests and Intervals
z Tests and Intervals

... of cars had a sample average GPA of 2.70 and a known population variance of 0.36. The n = 100 car owners had a sample average GPA of 2.54 and population variance of 0.40. Do the data present sufficient evidence to indicate a difference in the mean achievement between car owners and non-owners of car ...
Chapter 18 - Dustin Tench
Chapter 18 - Dustin Tench

Chapter 18 Notes MINE
Chapter 18 Notes MINE

Inference for the Mean of a Population
Inference for the Mean of a Population

Sampling Distribution of the Mean
Sampling Distribution of the Mean

Chapter 24 Comparing Means
Chapter 24 Comparing Means

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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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