,1. Which statistical test is most appropriate to compare
mean sales before and after a new marketing campaign?
- A) Chi-square test
- B) Paired t-test
- C) ANOVA
- D) Wilcoxon signed-rank test
Answer: B) Paired t-test
Rationale: The paired t-test is used to compare the
means of two related groups, like the same group's sales
before and after a marketing campaign.
2. What is the primary purpose of using a bootstrap
method in statistical analysis?
- A) To parameterize a model
- B) To estimate the distribution of a statistic
- C) To visualize data
- D) To determine causality
Answer: B) To estimate the distribution of a statistic
Rationale: Bootstrapping is used for estimating the
sampling distribution of a statistic by resampling with
replacement.
, enough statistical evidence to reject the null hypothesis.
4. Which measure is commonly used to determine the
effectiveness of a linear regression model?
- A) Mean
- B) Median
- C) R-squared
- D) Mode
Answer: C) R-squared
Rationale: R-squared indicates the proportion of the
variance in the dependent variable that is predictable from
the independent variable(s).
5. Which concept explains the risk of falsely identifying a
pattern in data visualization due to testing multiple
hypotheses?
- A) Overfitting
- B) Simpson's Paradox
- C) P-hacking
- D) Type II error
Answer: C) P-hacking
Rationale: P-hacking involves manipulating data and
analytical methods until non-significant results become
significant, thus identifying patterns that do not exist.
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