Take this Quiz: PSAT Data and Geometry — units, bases and figures in words | Zestly

Question 1

A shopkeeper increases the price of a shirt from 20 dollars to 25 dollars. What is the percentage increase in the price of the shirt?

Accepted Answer

25 percent

Answer

20 percent

Answer

5 percent

Answer

125 percent

Question 2

A scatterplot shows the relationship between the number of hours studied ($x$) and the test score ($y$). The line of best fit is $y = 5x + 50$. What does the slope of 5 represent?

Accepted Answer

The score increases by 5 points for every additional hour studied.

Answer

The starting score is 5.

Answer

The total score is 50 when 5 hours are studied.

Answer

The score increases by 50 points for every hour studied.

Question 3

In a group of 100 students, 40 play football and 60 do not. Of those who play football, 10 are in year 11. Of those who do not play football, 20 are in year 11. If a student is chosen at random from those who play football, what is the probability they are in year 11?

Accepted Answer

0.25

Answer

0.10

Answer

0.30

Answer

0.40

Question 4

A survey of 500 voters shows that 55 percent support a candidate with a margin of error of 3 percent. Which of the following is a valid conclusion?

Answer

Exactly 55 percent of all voters support the candidate.

Answer

The candidate definitely has more than 50 percent support.

Answer

It is plausible that the true population support is between 52 percent and 58 percent.

Answer

The margin of error will decrease if the sample size is reduced.

Question 5

A study observes that people who drink green tea daily have lower blood pressure than those who do not. Why can we not conclude that green tea causes lower blood pressure?

Answer

The sample size was too small.

Answer

The study did not measure heart rate.

Answer

The study was an experiment.

Answer

The study was observational and may have confounding variables.