1A - Statistics: The Language of Variation - Lauren Kawai | Biblioteka

Malena is a car buff who wants to find out more about the cars that high school students drive. The principal of a local high school gives Malena permission to go to the student parking lot and record some data. Later, Malena does some internet research on each model of car in the parking lot and makes a spreadsheet that includes each car's license plate, model, year, number of stickers on the car, color, weight (in kilograms), whether it has a navigation system, and highway gas mileage.

1

The individuals are ___________________

students that drive to school

cars in the student parking lot

students at Malena's high school

license plates

1

Select the 7 variables in the study.

1

Classify each variable as categorical or quantitative.

A professor suspects that most students in an 8 A.M. introductory statistics class did not complete the pre-class reading assignment. To find out, the professor gave the students a 10-question pop quiz about the assigned reading at the beginning of class. Here are the number of correct answers on the pop quiz for the 50 students in the class:

null

1

What proportion of students got fewer than 7 correct answers on the pop quiz? (Round to the hundredth place)

1

Does this result support the professor’s belief that most students did not complete the pre-class reading assignment? Justify your answer.

Yes, because most of the students got only 7 or 8 correct answers, which shouldn't happen if they completed the reading assignment.

No, because only 34% of the students got fewer than 7 correct answers on the pop quiz.

Yes, because 10% of the students got less than half of the questions correct.

No, because none of the students got all 10 questions correct.

A CubeSat is a miniature satellite used for space research that can be easily deployed from a launch vehicle or from the International Space Station. More than 1000 CubeSats have been launched since specifications for these satellites were jointly developed by Cal Poly San Luis Obispo and Stanford University in 1999. The relative frequency table summarizes data on the type of mission for each CubeSat launched in November and December 2019.

There were a total of 50 CubeSats launched during these two months.

null

1

A report states that a majority of these CubeSat launches had an imaging mission type. Explain why this statement is incorrect.

A majority implies greater than 50%. Only 34% of the missions were imaging, which is not a majority.

A majority implies less than 50%. All of the mission types occurred less than 50% of the time, so the statement is misleading.

A majority implies exactly 50%. However, 34% of the missions were imaging, which is less than 50%.

The Center for Disease Control and Prevention (CDC) states that adults should engage in at least 75 min of vigorous-intensity aerobic activity or 150 min of moderate-intensity aerobic activity weekly. Researchers gathered data from a random sample of adults who participated in the 2011–2012 National Health and Nutrition Examination Survey (NHANES).

null

1

The NHANES data are shown in the relative frequency table. What is the relative frequency of adults who are engaging in less than the minimum amount of recommended moderate-intensity physical activity weekly (less than 150 min)? Give your answer to two decimal places.

At the Census Bureau website, you can view detailed data collected by the American Community Survey. The following table includes data for 10 people chosen at random from the more than 1 million people in households contacted by the survey. “School” gives the highest level of education completed. null

1

The individuals in this data set are

the Census Bureau

10 people

households

1 million people

	Categorical	Quantitative
model
number of stickers on the vehicle
weight
highway gas mileage
year
color
whether it has a navigation system