Statistics Quiz

What is the mean of the data set {0, 2, 4, 8, 16, 36}?

• 8.0

• 11.0

• 12.0

• 13.2

This data represent the number of books Sarah read each month: {1, 1, 3, 3, 4}. What is the approximate standard deviation of the data set?

• 1.2

• 2.4

The probability distribution of the number of piglets per litter on a farm is given below. Piglet Births per Litter n piglets 4 5 6 Probability of n piglets 0.2 0.4 0.4 What is the expected number of piglets per litter on this farm?

• 4.8

• 5.0

• 5.2

• 5.8

The school principal wants to know if students like the school mascot. She asks 120 students throughout the day. Which of these is the population?

• 120 students

• All the students that like the mascot

• All the students that do not like the mascot

• All the students in the school.

A store owner wants to know if he sells more water or sports drinks. He records the number of sales for both products. What is the data-gathering technique used?

• experiment

• randomized survey

• observational study

• voluntary survey

A math student wants to know if listening to Mozart while sleeping will improve his test scores. Which of these is the null hypothesis?

• There will be no change in the test scores

• The test scores will improve

• The test scores will go down

• The student will pass all his tests.

A teacher wants to know what students think about the new cafeteria. The teacher asks every tenth student to take the survey. What type of sample is this?

• stratified

• systematic

• self-selected

• cluster

What is the mean of the data set {3, 3, 3, 12, 12}?

A bird watcher keeps track of how many birds she sees each day: {2, 2, 2, 4, 4, 2}. What is the standard deviation of the data set?

The probability distribution for the number of pages that Rocco can read in an hour is given below. What is the expected number of pages that Rocco will read in any hour?