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Two random samples of sizes 30 and 36 are selected independently from two populations with means 80 and 88, and standard deviations 15 and 20, respectively.
a.
Find the standard error of the difference betweenand.
b.
Find the probability that the mean of the first sample is smaller than the mean of the second sample.
Null Hypothesis
A general statement or default position that there is no difference or effect, typically to be tested against an alternative hypothesis.
Income Bracket
Categories of income range used for tax purposes or to analyze economic data, showing the distribution of population by income levels.
Political Party
A group of individuals united by similar political goals and views, aiming to affect policy decisions by having their members elected into governmental positions.
Level of Significance
A threshold chosen by the researcher that determines when to reject the null hypothesis in statistical testing.
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