A study finds that there is a correlation between ice cream sales and crime rates. What can we conclude from this finding alone?
This is a coincidence and there is no relationship.
Crime rates influence ice cream sales.
There is a relationship between ice cream sales and crime rates, but we cannot determine causality.
Eating ice cream causes crime.
A study analyzing the average income of doctors uses data from a publicly available database containing salary information for all licensed physicians in a country. What type of data collection method is this?
Observation
Experiment
Survey
Secondary Data Analysis
If the range of a dataset is 20, and the smallest value is 5, what is the largest value?
20
25
Cannot be determined
15
Which of the following best describes a Type II error?
Rejecting the alternative hypothesis when it is actually true.
Rejecting the null hypothesis when it is actually true.
Accepting the alternative hypothesis when it is actually false.
Failing to reject the null hypothesis when it is actually false.
What is the range of the following dataset: 7, 12, 4, 9, 15, 11?
4
11
8
Which of the following is NOT a measure of dispersion?
Variance
Median
Range
Standard Deviation
What does a variance of zero indicate about a dataset?
All data points are the same.
The dataset has a large amount of variation.
The mean is zero.
The data is perfectly normally distributed.
Which chart type is most suitable for visualizing the relationship between two continuous variables?
Scatter Plot
Pie Chart
Box Plot
Bar Chart
A frequency distribution shows the:
Number of times each value of a variable occurs in a dataset
Probability of a particular outcome in an experiment
Average value of a variable in a dataset
Spread or variability of data points around the mean
A dataset contains the ages of students in a class: 18, 19, 18, 20, 21, 18. What is the mode of this dataset?
19
21
18