1. Question 1 — Select all that apply

✅ The null hypothesis is assumed to be true unless there is convincing evidence to the contrary.
✅ The null hypothesis typically assumes that observed data occurs by chance.

❌ The null hypothesis is accepted only if there is convincing evidence
❌ The null hypothesis assumes observed data does NOT occur by chance

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2. Question 2

✅ Significance level

❌ P-value
❌ Alternative hypothesis
❌ Confidence interval

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3. Question 3

✅ P-value and significance level

❌ Alternative hypothesis + significance level
❌ P-value + alternative hypothesis
❌ Confidence level + significance level

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4. Question 4 — Select all that apply

✅ They have made an error known as a false negative.
✅ They have failed to reject a null hypothesis, which is actually false.

❌ False positive
❌ Concluded result occurred by chance but was significant

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5. Question 5

✅ Select the sample data

❌ Reject/fail to reject
❌ Find the p-value
❌ Identify assumption

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6. Question 6

p-value = 3.3% < 5%
➡ Reject H₀

✅ Reject the null hypothesis.

❌ Fail to reject
❌ Reject alternative
❌ Fail to reject alternative

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7. Question 7

Null: no difference between two population proportions →
✅ Two-sample z-test

❌ Two-sample t-test
❌ One-sample z-test
❌ One-sample t-test

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8. Question 8

Argument a=530 → data for first sample
✅ Observations from the first sample

❌ Significance level
❌ Variance assumption
❌ P-value

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9. Question 9

Group that gets current layout →
✅ Control group

❌ Constant group
❌ Holdout group
❌ Treatment group

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10. Question 10

Best way to avoid irrelevant factors →
✅ Randomize group assignment

❌ No way to minimize
❌ Use age
❌ Self-select

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🧾 Summary Table of All Answers

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