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STT 231 EXAM 3A | QUESTIONS AND ANSWERS | 2026 UPDATED - MSU.

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STT 231 EXAM 3A | QUESTIONS AND ANSWERS | 2026 UPDATED - MSU.

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STT 231 EXAM 3A | QUESTIONS AND ANSWERS | 2026
UPDATED - MSU.



Types of Confidence Intervals - (answer)- one proportion

- one mean

- difference in proportions

- difference in means



bigger confidence level - (answer)wider



bigger sample size - (answer)narrower



adding a constant - (answer)same width



interpretation of confidence interval - (answer)ONLY ONE CORRECT ANSWER

"we are 95% confident the true parameter is between..."



Hypothesis Test for Difference in Proportions - (answer)pi1 - pi2



conditions:

- independent observations

- 10 successes and 10 failures in BOTH groups



Hypothesis Test for Difference in Means - (answer)mu1 - mu2



conditions:

- independent observations

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