7th grade SC READY Practice Test REVIEW!!

There are 25 prime numbers between 1 and 100. There are 46 prime numbers between 1 and 200.

Which situation is more likely?

• A computer produces a random number between 1 and 100 that is prime.

• A computer produces a random number between 1 and 200 that is prime.

Select all the reasons why random samples are preferred over other methods of getting a sample.

• If you select a random sample, you can determine how many people you want in the sample.

• A random sample is always the easiest way to select a sample from a population.

• A random sample is likely to give you a sample that is representative of the population.

• A random sample is a fair way to select a sample, because each person in the population has an equal chance of being selected.

• If you use a random sample, the sample mean will always be the same as the population mean.

The numbers 1 through 10 are put in one bag. The numbers 5 through 14 are put in another bag.

When you pick one number from each bag, what is the probability you get the same number?

• 6/14

• 10/100

• 10/14

• 6/100

Data collected from a survey of American teenagers aged 13 to 17 was used to estimate that 29% of teens believe in ghosts. This estimate was based on data from 510 American teenagers. What is the population that people carrying out the survey were interested in?

• All people in the United States.

• The 510 teens that were surveyed.

• All American teens who are between the ages of 13 and 17.

• The 29% of the teens surveyed who said they believe in ghosts.

Lin wants to know if students in elementary school generally spend more time playing outdoors than students in middle school. She selects a random sample of size 20 from each population of students and asks them how many hours they played outdoors last week. Suppose that the MAD for each of her samples is about 3 hours.

 

Select all pairs of sample means for which Lin could conclude there is a meaningful difference between the two populations.

• elementary school: 12 hours, middle school: 10 hours

• elementary school: 14 hours, middle school: 9 hours

• elementary school: 13 hours, middle school: 6 hours

• elementary school: 13 hours, middle school: 10 hours

• elementary school: 7 hours, middle school: 15 hours

• 0.01

• 1/2

• 75%

• 1

• Every person that rides the bus is older than the age of 16.

• Every person that rides the bus is younger than the age of 29.

• Most people that ride the bus are older than the age of 25.

• Most people that ride the bus are younger than the age of 25.

• 1

• 3

• 4

• 10

• The students in Class A most likely studied more than the students in Class B.

• The students in Class B most likely studied more than the students in Class A.

• The students in Class B most likely studied for a wider variety of times than the students in Class A.

• The students in Class A most likely studied for a wider variety of times that the students in Class B.

• The students in Class A and Class B most likely studied the same amount of time.

• The interquartile ranges for both cities are about 1.

• The interquartile ranges for both cities are about 3.

• The ranges for both cities are about 3.5.

• The ranges for both cities are about 1.5.