UExcel Statistics 2

Question 1

What is a Type I error in hypothesis testing?

Accepted Answer

Rejecting a true null hypothesis

Answer

Failing to reject a false null hypothesis

Answer

Accepting the alternative hypothesis incorrectly

Answer

Using a sample that is too small

Question 2

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

Accepted Answer

Mean

Answer

Mode

Answer

Median

Answer

Range

Question 3

In a box plot, the box itself represents:

Accepted Answer

The interquartile range (IQR)

Answer

The range of the entire dataset

Answer

The standard deviation

Answer

The mean plus or minus one standard deviation

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

There is a 95% chance the parameter is in the interval

Answer

The sample statistic equals the population parameter 95% of the time

Answer

95% of data values fall within the interval

Question 5

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

Accepted Answer

Continuous variable

Answer

Discrete variable

Answer

Nominal variable

Answer

Ordinal variable

Question 6

What is the purpose of a chi-square test?

Accepted Answer

To test the relationship between categorical variables

Answer

To compare two population means

Answer

To calculate standard deviation

Answer

To determine regression coefficients