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Measure of central tendency

Find the median of the data set: 3, 7, 8, 12, 15, 20, 25.

Measure of central tendency

Calculate the mean of the following scores: 10, 15, 20, 25, 30.

Data Representation

Draw a bar graph for the following data on the sales of different products:

Product A: 50

Product B: 70

Product C: 30

Product D: 90

Data Representation

Construct a frequency distribution table for the following data: 5, 8, 8, 10, 12, 15, 15, 15, 20, 22, 25.

Hypothesis testing

What is a null hypothesis? Give an example of a null hypothesis in a practical situation.

Correlation

Explain what correlation means. How would you calculate the correlation coefficient between two variables?

Sampling methods

Describe different sampling methods (e.g., random sampling, stratified sampling) and give examples of when to use each.

Random variables

What is a random variable? Provide examples of discrete and continuous random variables.

Cumulative frequency

Define cumulative frequency. How do you calculate it from a frequency distribution table?

Histogram

What is a histogram, and how is it different from a bar graph? Construct a histogram for the following frequency distribution:

Age (years): 0-10, 11-20, 21-30

Frequency: 5, 8, 12