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Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal. For example, if a/b = c/d, then a, b, c, and d are in proportion.

Front

How do you find a percentage of a total?

Back

To find a percentage of a total, multiply the total by the percentage (in decimal form). For example, to find 20% of 50, calculate 50 * 0.20 = 10.

Front

What is the formula for predicting outcomes based on a sample?

Back

The formula is: (Number of favorable outcomes in the sample / Total number of outcomes in the sample) * Total number of outcomes in the population.

Front

If 3 out of 20 students prefer chocolate ice cream, how do you predict the number of chocolate ice cream lovers in a class of 100 students?

Back

Use the proportion: (3/20) * 100 = 15. So, you would predict 15 students prefer chocolate ice cream.

Front

What is a random survey?

Back

A random survey is a method of collecting data where each member of a population has an equal chance of being selected.

Front

How do you calculate the expected number of incorrect answers on a test?

Back

To calculate the expected number of incorrect answers, use the ratio of incorrect answers from a smaller test and apply it to the larger test. For example, if 4 out of 25 are incorrect, for 150 questions, it would be (4/25) * 150 = 24.

Front

What does it mean to extrapolate data?

Back

Extrapolating data means estimating or predicting values outside the range of the data you have, based on the trends observed in the data.

Front

What is a sample in statistics?

Back

A sample is a subset of a population used to represent the whole population in statistical analysis.

Front

How do you convert a fraction to a percentage?

Back

To convert a fraction to a percentage, divide the numerator by the denominator and then multiply by 100. For example, 1/4 = 0.25 * 100 = 25%.

Front

What is the importance of sample size in surveys?

Back

A larger sample size generally leads to more accurate and reliable results, as it better represents the population.