AP Statisticshardmcq1 pt
Why use a t interval instead of a z interval for means?
A.σ is usually unknown and must be estimated
B.t is always narrower
C.the mean is unknown
D.the sample is not random
Explanation
Core Concept
Estimating σ adds uncertainty.
Correct Answer
Aσ is usually unknown and must be estimated
More Unit 7: Inference for Quantitative Data: Means practice questions
- mediumA test computes t = 2.3 with df = 15, giving a small p-value. The interpretation is
- easyA one-sample t interval's conditions include
- hardWhich pairing of procedure and data is correct?
- mediumA two-sample t test with t = 0.1 likely gives
- hardFor the same confidence level, which has the largest critical value?
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