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

The average of all values

Answer

The middle value in a sorted dataset

Answer

The difference between the highest and lowest values

Question 2

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

Accepted Answer

The mean, median, and mode are all equal

Answer

It is skewed to the right

Answer

It has two peaks

Answer

The tails touch the x-axis

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

There is a 3% chance the null hypothesis is true

Answer

The effect size is small

Answer

The result is not statistically significant

Question 4

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

Accepted Answer

9

Answer

7

Answer

10

Answer

12

Question 5

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

Accepted Answer

Simple random sampling

Answer

Convenience sampling

Answer

Stratified sampling

Answer

Cluster sampling

Question 6

A correlation coefficient of -0.85 indicates:

Accepted Answer

A strong negative relationship

Answer

A weak positive relationship

Answer

No relationship

Answer

A weak negative relationship