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STT 231 EXAM 2 PRACTICE SOLUTION TEST 2026 TESTED QUESTIONS AND ACCURATE ANSWERS GRADED A+

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STT 231 EXAM 2 PRACTICE SOLUTION TEST 2026 TESTED QUESTIONS AND ACCURATE ANSWERS GRADED A+

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STT 231 EXAM 2 PRACTICE SOLUTION TEST
2026 TESTED QUESTIONS AND ACCURATE
ANSWERS GRADED A+

●● when to use z test.
Answer: PROPORTION


●● conditions for t test.
Answer: 1. Independent
2. Population nearly normal OR our sample size is big enough


●● conditions for z test.
Answer: random, 10%, success/failure


●● when is CLT used.
Answer: PROPORTION


●● What is standard error.
Answer: same as standard deviation, but we call it "standard error"
because we plugged in p hat for p (we are estimating)


*standard deviation of the statistic!

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