Chapter One
Chapters 1 & 2
Chapter 2
Chapters 2 & 3
Chapter 3
100

A group of researchers went around and asked people if they have spent more than $100 this week. Is this a categorical or quantitative variable?

Categorical

100
The professor of a 421 student biology class wanted to know how many students could get 100% on a pop quiz. He didn't want to take class time away from the entire class so he took 30 volunteer students to take the quiz. What is the population of this experiment?

The 421 students in the biology class

100

The following is the amount of hours a group of 360 students spend studying:

0-5 hours: 43

6-10 hours: 87

11-15 hours:129

16-20 hours: 59

21+ hours: 42

What is the cumulative percent frequency of students studying 11-15 hours a week?

72%

100

The frequency is another word for what?

The count

100

What is the range of the following data:

13,9,63,45,67,19,88,12,29

79

200

A group of researchers sat near a sidewalk that had a bump in it. They counted how many people tripped as they were walking past. Is this an experiment or an observational study?

Observational study

200

What is resistant to outliers?

The median

200

The last set of data should have a cumulative percent frequency of?

100%

200

The correlation coefficient for number of ice cream sales and temperature is 0.97. This means that:

There is a strong positive correlation between the temperate and number of ice cream sales.

200

What is the Q1 of the following data?

1,2,2,3,4,6,6,8,9,10,10,15,17,20,22,22,25


3.5

300

NAU admin wanted to know how many students were utilizing the library to study for exams. They selected 10 classes from the university and had them fill out a survey answering either yes or no to using the library. What is the sample in this experiment?

The 10 classes at NAU
300
What is the formula for percent frequency?

frequency/total x 100

300

The following is the amount of hours a group of 240 students spend studying:

0-5 hours: 33

6-10 hours: 21

11-15 hours:99

16-20 hours: 52

21+ hours: 35

What is the cumulative frequency of students who spend 16-20 hours studying?

205

300

Outliers are either ___ low values or ___ high values that differ from the rest of the data set. (both blanks are the same word)

Extreme

300

What is the inner-quartile range of the following data:

22,35,46,55,71,74,78,84,90,96,100

44

400
A group of 10 people tried seeing how long they can hold a handstand. The results (in seconds) were:

2,3,3,4,5,5,7,9,9,9. What is the average amount of time someone could hold a handstand?

5.6 seconds

400
What is the median for the data shown below:


23,21,44,37,56,28,28,29,43,42,51,57

39.5

400

Refer to Table 1 on the board. What is the percent of people who live on a mountain and are scared of heights?

16.67%

400

A student sat outside and observed the color of people's shirts who walked by. B=black, W=white, G=green, and P=purple:

P,B,B,B,W,B,W,B,W,B,G,W,G,G,G,P,P,W,B,W

What percent of people are wearing black shirts?

35%

400

What is the 5 number summary for the following data:

21,24,25,28,32,33,37,38,43,51,59

Min: 21

Q1:25

Median: 33

Q3: 43

Max: 59

500
A few students at NAU tested their reaction time in their phone by seeing how quickly they could turn their timer on and off. They recorded the results in seconds. This is an example of ____ data.

Continuous

500

What is an ordinal variable?

Named, natural order, equal interval between variables

500

Refer to Table A on the board. What is the percent of people who are not scared of heights also live on a mountain?

36.48%

500

In a sample of 436 students whose mean height is 64.6 inches, 171 were women. If the mean height of the women was 61.9 inches, what is the mean height of the men in the sample?

64.6 inches

500

In a sample of 50 students whose mean age is 21 years, 21 were women. If the mean age of the women was 20, what is the mean age of the men in the sample?

21.7 years

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