End of Statistics

A grocery store polls every 20th customer to determine if they are satisfied with the cleanliness of the store. Forty customers are surveyed, and 26 are satisfied. What conclusion can be drawn for the 800 daily customers?

• 65% of the customers are unsatisfied with the cleanliness of the store

• Of the 800 customers, 520 would be satisfied with the cleanliness of the store

• 40% of the customers are satisfied with the cleanliness of the store.

• 25% of the customers are not satisfied with the cleanliness of the store.

At the zoo, the length of each iguana is measured. Which statement is best supported by the information below?

• Over half of the iguanas measure 14 centimeters or more in length.

• 25% of the iguanas measure 12 centimeters in length.

• The number of iguanas that measure 15 centimeters or more is equal to the number that measure 11 centimeters or less.

If there are 220 members of the 7th grade class, then how many students can be expected to prefer the zoo?

There were 40 students from each grade surveyed.

• 39

• 48

• 120

• 66

If there are 180 members of the 8th grade class, then what percent preferred either the museum or the sports complex?

There were 40 students from each grade surveyed.

• 65%

• 47.5%

• 17.5%

• 26%

Which of the following represents the mean absolute deviation of Jamal’s data?

• 6.4

• 1.12

• 2.8

• 0.9

Which of the following groups is NOT considered a sample of the US population?

• Women who live in the US

• People who are registered to vote in the US

• Europeans who vacation in the US

• Students who attend public schools in the US

A company surveyed all of the employees in their Columbus, Ohio office, one of their six national offices. Based on the survey they determined that 72% of all employees were satisfied with their job. Which of the following explains why this is NOT a random sample?

• They only surveyed people who had been at their job for five years or more

• They did not survey employees in other offices around the country

• The survey was conducted electronically

• The survey had a time limit

The data set below represents the different costs of a tablet at an electronic store.

$298, $196, $248, $379, $319, $276, $198, $349

What is the median of the first half of the data? (first quartile)

• $223

• $287

• $379

The dot plot below represents the number of dollars in allowance that students receive each week in Ms. Koch's class. What is the median amount of allowance?

• 5

• 6

• 7.5

• 8

The number of points in the first five games of the basketball season are listed below. What is the mean number of points scored?