Which of the following is NOT a core component of statistical analysis?
Data Collection
Algorithm Development
Probability Assessment
Data Interpretation
Which of the following is an example of inferential statistics?
Finding the range of ages among employees in a company
Estimating the average income of all citizens in a country based on a sample
Calculating the average height of students in a class
Creating a bar chart to show the distribution of grades on an exam
What is the range of the following dataset: 7, 12, 4, 9, 15, 11?
8
4
11
15
What level of measurement is represented by the ranking of restaurants from 1 to 5 stars?
Ordinal
Interval
Nominal
Ratio
What does a variance of zero indicate about a dataset?
All data points are the same.
The data is perfectly normally distributed.
The dataset has a large amount of variation.
The mean is zero.
A frequency distribution shows the:
Average value of a variable in a dataset
Number of times each value of a variable occurs in a dataset
Spread or variability of data points around the mean
Probability of a particular outcome in an experiment
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
Secondary Data Analysis
Survey
Experiment
A researcher wants to study the spending habits of shoppers at a mall. They randomly select every 10th shopper entering the mall to participate in a survey. What type of sampling method is this?
Systematic Sampling
Stratified Sampling
Simple Random Sampling
Cluster Sampling
If you roll a fair six-sided die, what is the probability of getting an even number?
1/6
1/2
1/3
2/3
A bag contains 5 red balls and 3 blue balls. What is the probability of drawing a red ball at random?
3/5
5/8
3/8