Drawing a card from a deck and then drawing another card without replacing the first is an example of:
Complementary events
Dependent events
Independent events
Mutually exclusive events
What does the significance level (alpha) represent in hypothesis testing?
The probability of obtaining the observed data.
The probability of making a Type II error.
The strength of the relationship between variables.
The threshold below which we reject the null hypothesis.
The area under a probability distribution curve represents:
The standard deviation of the distribution
The total probability of all possible outcomes, which always equals 1
The probability of a specific value occurring
The mean of the distribution
Which of the following data types is most suitable for storing the number of children in a family?
Continuous
Discrete
Ordinal
Nominal
Which of the following chart types is MOST effective for displaying data that changes over time?
Pie Chart
Box Plot
Line Graph
Scatter Plot
What is the commonly used significance level (alpha) in hypothesis testing?
0.05
0.50
0.10
0.01
A dataset contains the ages of students in a class: 18, 19, 18, 20, 21, 18. What is the mode of this dataset?
18
21
20
19
Which of the following best describes a Type II error?
Rejecting the alternative hypothesis when it is actually true.
Accepting the alternative hypothesis when it is actually false.
Rejecting the null hypothesis when it is actually true.
Failing to reject the null hypothesis when it is actually false.
A researcher surveys 100 people and asks them how many pets they own. What type of graph would be most appropriate for displaying the frequency of each response (number of pets)?
Pie chart
Line graph
Histogram
Scatter plot
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?
Survey
Experiment
Secondary Data Analysis
Observation