UExcel Statistics 2

Question 1

What is a Type I error in hypothesis testing?

Accepted Answer

Rejecting a true null hypothesis

Answer

A Type I error (false positive) occurs when a true null hypothesis is incorrectly rejected.

Question 2

Which measure of central tendency is most affected by extreme outliers?

Accepted Answer

Mean

Answer

The mean is most sensitive to outliers because it incorporates every value in its calculation.

Question 3

In a box plot, the box itself represents:

Accepted Answer

The interquartile range (IQR)

Answer

The box in a box plot spans from Q1 to Q3, representing the interquartile range.

Question 4

What does a confidence interval of 95% mean?

Accepted Answer

If sampling were repeated many times, 95% of intervals would contain the true parameter

Answer

A 95% confidence interval means that 95% of such intervals constructed from repeated samples would contain the true population parameter.

Question 5

Which type of variable can take any value within a range?

Accepted Answer

Continuous variable

Answer

A continuous variable can take any value within a range, including fractional values.

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