Assumptions of t Procedures for Means
Independence Assumption:
Check these two conditions to decide whether independence is plausible:
Randomization Condition: Were data generated from a simple random
sample or from a properly randomized experiment using a between-subject
design?
If a different design was used, how did this affect independence? (see later in
course)
10% Condition: Is the s
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Assumptions of t Procedures for Means
Independence Assumption:
Check these two conditions to decide whether independence is plausible:
Randomization Condition: Were data generated from a simple random
sample or from a properly randomized experiment using a between-subject
design?
If a different design was used, how did this affect independence? (see later in
course)
10% Condition: Is the sample size no more than 10% of the population?
(Not a big issue with means, unlike for proportions)
Normal Population Assumption:
The sample needs to be large enough for us to be able to use the Central Limit Theorem
(CLT). For small to moderate samples:
Nearly Nor
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