MATH 110 Module ALL MODULES (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) Exam / MATH110 Introduction to Statistics: Portage Learning

MATH 110 Module ALL MODULES (1, 2, 3,
4, 5, 6, 7, 8, 9, 10) Exam / MATH110
Introduction to Statistics: Portage Learning
exam 2025


1. What is the level of measurement for a list of ZIP codes?

• Interval

• Ratio

• Nominal

• Ordinal
Nominal data consists of names or categories without an implied
order, such as ZIP codes.

2. Which of the following is a parameter?

• The average income of all residents in a city

• The average income of a sample

• A percentage from a political poll

• A sample mean from a survey
A parameter describes a characteristic of an entire population.

3. What type of sampling involves dividing the population into groups and
randomly selecting entire groups?

,• Simple random

• Systematic

• Cluster

• Stratified
Cluster sampling involves selecting entire groups (clusters)
randomly.

4. The mean of the data set {4, 6, 9, 3, 8} is:

• 6

• 6

• 5

• 7
The mean is (4+6+9+3+8)/5 = 30/5 = 6.

5. A data set has a median of 55 and a mean of 60. What can you infer about
the distribution?

• Symmetric

• Skewed right

• Skewed left

• Uniform
If the mean is greater than the median, the data is right-skewed.

6. Which of the following best describes a histogram?

• A chart using percentages

,• A circular chart

• A plot of data points

• A bar graph representing frequency intervals
A histogram is a bar graph that displays the distribution of
numerical data.

7. What is the mode of the set {3, 3, 6, 9, 9, 9, 12}?

• 3

• 6

• 9

• 12
The mode is the most frequently occurring number.

8. What does standard deviation measure?

• Central tendency

• Spread of data around the mean

• Type of sampling

• Shape of a histogram
Standard deviation indicates how spread out the values are
around the mean.

9. In a normal distribution, approximately what percentage of data falls within
two standard deviations of the mean?

• 50%

, • 68%

• 95%

• 99.7%
According to the Empirical Rule, ~95% of the data falls within ±2
SDs.

10.A z-score of -2.5 indicates:

• The value is above the mean

• The value is 2.5 standard deviations below the mean

• The value is the average

• The value is 2.5 SDs above the mean
A negative z-score indicates a value below the mean.

11.If the standard deviation is zero, what can you say about the data?

• Spread is normal

• Some variation exists

• All data points are the same

• There's an error
A standard deviation of 0 means all values are equal.

12.What is the symbol for population mean?

• μ

• x̄

• σ