UExcel Statistics

Question 1

What does the standard deviation measure in a dataset?

Accepted Answer

The spread or dispersion of values around the mean

Answer

Standard deviation measures how spread out values are around the mean.

Question 2

Which of the following is a characteristic of a normal distribution?

Accepted Answer

The mean, median, and mode are all equal

Answer

In a normal distribution, the mean, median, and mode are all equal and located at the center.

Question 3

A p-value of 0.03 in hypothesis testing means:

Accepted Answer

There is a 3% probability of obtaining the observed result if the null hypothesis is true

Answer

A p-value represents the probability of observing the data if the null hypothesis were true.

Question 4

What is the median of the dataset: 3, 7, 9, 12, 15?

Accepted Answer

9

Answer

The median is the middle value of a sorted dataset, which is 9 in this case.

Question 5

Which sampling method gives every member of the population an equal chance of being selected?

Accepted Answer

Simple random sampling

Answer

Simple random sampling ensures each population member has an equal probability of selection.

UExcel Practice Test