Unit 1 : Quiz

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Question 1 of 5

1. Question

Q1. Which statement best distinguishes descriptive from inferential statistics?

Descriptive statistics summarize and visualize data; inferential statistics generalize findings to a population.
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Descriptive statistics involve sampling; inferential statistics focus on entire populations.
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Descriptive statistics rely on probability theory; inferential statistics do not.
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Descriptive statistics are qualitative; inferential statistics are quantitative.
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Question 2 of 5

2. Question

Q2. Which measure of central tendency is least affected by extreme values (outliers)?

Mean
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Median
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Mode
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Range
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Question 3 of 5

3. Question

Q3. Which statement about covariance and correlation is true?

Covariance measures both direction and strength of a relationship.
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Correlation only measures direction, not strength.
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Covariance is scale-dependent, while correlation is standardized between -1 and +1.
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Both covariance and correlation are unaffected by the scale of measurement.
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Question 4 of 5

4. Question

Q4. When should you use a t-statistic instead of a z-statistic for confidence interval estimation?

When the population variance is known and sample size is large (n > 30).
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When the population variance is unknown and sample size is small (n < 30).
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When the population mean equals zero.
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When the data is nominal or ordinal.
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Question 5 of 5

5. Question

Q5. Which example best represents a ratio scale variable?

Temperature in Celsius
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Movie ratings (1 to 5 stars)
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Annual income in dollars
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Calendar year
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Unit 1 : Quiz

Quiz Summary

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