Statistics

What does standard deviation measure?

• Central tendency

• Data dispersion

• Data median

• Data mode

Which distribution is bell-shaped and symmetrical?

• Poisson distribution

• Normal distribution

• Binomial distribution

• Exponential distribution

What is the purpose of a t-test?

• Compare variances

• Measure correlation

• Measure the torqu

• Compare means of two groups

What is the purpose of ANOVA?

• Compare means of more than two groups

• Compare variances

• Measure correlation

• Find data mode

What is the non-parametric equivalent of ANOVA?

• Kolmogorov Smirnov

• Kruskal Wallis

• t-test

• z-test

What does a p-value indicate in hypothesis testing?

• Probability of guessing a true value

• Sample variability

• Confidence level

• Strength of evidence against the null hypothesis

Which distribution models the number of successes in fixed independent trials?

• Binomial distribution

• Poisson distribution

• Normal distribution

• Exponential distribution

What is a Type I error in hypothesis testing?

• Rejecting a false null hypothesis

• Accepting a false null hypothesis

• Rejecting a true null hypothesis

• Accepting a true null hypothesis

Which measure is most affected by outliers?

• Median

• Mode

• Interquartile range

• Mean

In a normal distribution, what (approx.) percentage of data falls within one standard deviation from the mean?

• 68%

• 75%

• 95%

• 99.7%