Understanding Predictions in Statistics

What is the main purpose of using a sample in statistics?

• To increase the accuracy of data collection

• To ensure every individual in a population is surveyed

• To save time and resources when studying a large population

• To focus only on a specific subgroup within a population

In the context of making predictions using ratios, what does a good sample ensure?

• The sample size is larger than the population

• The sample is collected from a single location

• The ratios of responses in the sample match those of the population

• The sample only includes individuals with similar characteristics

What is the probability that a student brought a photo from a theme park if 11 out of 28 students did so?

• 11/28

• 11%

• 28%

• 39%

How can you solve a ratio problem if you cannot easily multiply to find the answer?

• By cross multiplying the terms

• By using a calculator

• By using a different sample

• By guessing the answer

How do you express 6 out of 10 students having a blog as a percentage?

• 16%

• 10%

• 6%

• 60%

What is the result of cross multiplying 3/5 = s/250?

• 250 = 3s

• 150 = 5s

• 750 = 5s

• 5 = 750s

What is the first step in using the percent equation to make predictions?

• Divide the percentage by the total number

• Convert the percentage to a decimal

• Multiply the percentage by 100

• Convert the percentage to a fraction

If 85% of students use emoticons, how do you calculate the number of students using them out of 2,450?

• Multiply 2,450 by 0.85

• Divide 2,450 by 0.85

• Add 85 to 2,450

• Subtract 85 from 2,450

What equation would you use to find how many students have a TV in their bedroom if 46% do?

• Whole = Percent / Part

• Whole = Part x Percent

• Part = Percent x Whole

• Percent = Part / Whole

If 46% of 1,370 students have a TV in their bedroom, how many students is that?

• 46

• 460

• 137

• 630