7.SP.2

Front

What is a sample in statistics?

Back

A sample is a subset of a population used to represent the entire group.

Front

What is the importance of random sampling?

Back

Random sampling ensures that every member of the population has an equal chance of being selected, which helps to avoid bias.

Front

How do you predict the total number of students who own pets based on a sample?

Back

Use the proportion of pet owners in the sample to estimate the total in the population. For example, if 32 out of 50 own pets, then (32/50) * total students gives the estimate.

Front

What does it mean if a survey's results are not representative?

Back

It means the sample does not accurately reflect the population, leading to biased or incorrect conclusions.

Front

What is the formula for calculating a proportion?

Back

Proportion = (Part / Whole) * 100.

Front

If 2 out of 125 residents have the flu, how do you find the estimated number of residents with the flu in a town of 2500?

Back

Use the proportion: (2/125) * 2500 = 40 residents.

Front

What is the significance of the term 'scope' in survey results?

Back

Scope refers to the extent to which the survey results can be generalized to a larger population.

Front

How can you improve the accuracy of an estimate?

Back

Increase the sample size or ensure the sample is randomly selected from the population.

Front

What does it mean for a map scale to be 1 cm = 25 km?

Back

It means that every centimeter on the map represents 25 kilometers in reality.

Front

How do you calculate the distance represented by multiple centimeters on a map?

Back

Multiply the number of centimeters by the scale factor. For example, 7 cm * 25 km/cm = 175 km.