What is the primary use of a bar chart?
Comparing values across different categories
Representing parts of a whole
Displaying the relationship between two continuous variables
Showing the distribution of a continuous variable
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
1/2
3/8
What is the highest level of measurement for the variable 'weight of apples'?
Interval
Nominal
Ratio
Ordinal
In a probability distribution, what does a higher peak indicate?
Smaller sample size
Higher probability of values around the peak
Lower probability of values around the peak
Greater variability in the data
Events A and B are independent. The probability of A is 0.4, and the probability of B is 0.5. What is the probability of both A and B happening?
0.9
0.1
0.2
0.7
The mean of a dataset is 15 and the standard deviation is 3. What percentage of data points lie within 12 and 18?
Cannot be determined from the given information
Approximately 68%
Approximately 95%
Approximately 99.7%
A researcher wants to study the opinions of nurses in a hospital. They randomly select 5 departments and then survey every nurse in those departments. What sampling method is being used?
Systematic Sampling
Simple Random Sampling
Cluster Sampling
Stratified Sampling
A researcher wants to survey a sample of students from a university. They randomly select 5 departments and then survey every student within those departments. What sampling method is being used?
The probability of an event happening is 0.3. What is the probability of the event NOT happening?
0.6
1
0.3
Which measure of central tendency is most affected by extreme values (outliers)?
Mode
All are equally affected
Median
Mean