Students must be able to justify their solutions to systems of equations. They must understand that a solution to a system of equations is the ordered pair that makes both equations true. Students need more instruction on simple random sampling techniques. They must be able to identify a method that uses simple random sampling techniques. They must be able to design an investigation using simple random sampling techniques.
Sample size is also an important factor in an investigation.
Students need more experiences in designing simulations especially when probability is a factor in the design. They also need to explain how to run the experiment to get data and how to use the data to make predictions. Students need more experiences determining which measure of central tendency is the most useful in different situations. Students must be able to determine the measures of central tendency when given a frequency table. They need to understand measures of variability and how to use them to interpret the data and make comparisons between data sets.