Boxplots
Calculator Readout
Sampling Methods
Lots of Trees
Statistical Questions
100
What are the five points you need to make a box plot?
Minimum, Q1, Median, Q3, and Maximum
100
Identify the Population Standard Deviation rounded to the nearest thousandth.
What is 26.895
100
A survey is conducted where a proportional number of students from each grade level in the school are surveyed.
Which sampling method best describes this sampling technique?
Stratified Random Sampling
100
What's the mode of the following data?
43
100
Determine whether a survey, observational study, or experimental study would be the best way to collect data to answer the question.
How has the percentage of the world’s wealth owned by the top 1% of individuals changed over the past 300 years?
Observational Study
200
What is the Interquartile Range?
Q3-Q1
200
Identify the interquartile range
What is 254 - 203 = 51
200
John wants to select a sample of five names from his class of thirty students to respond to a questionnaire. He first obtains a list of students and assigns each student a different number from 1 to 30. He then uses his calculator to generate five random numbers from 1 to 30 and selects the five names that correspond to the random numbers. What type of sample is this?
Simple Random Sample (SRS)
200
What are the outliers of the dataset? (Without calculating)
56, 61, 75
200
Which of the following topics is quantitative data?
A. Phone Numbers
B. Age
C. Zip Codes
D. Area Codes
Age
While the other groups include numerical outputs, they are categorical variables used for grouping
300
Find the Q1 and Q3 of the data set:
5,6,6,7,7,8,9,10,11,11,11,12,13,14,15,16,16,18
Q1 = 7
Q3 = 14
300
Identify the sample standard deviation, rounded to the nearest thousandth
What is 29.050
300
A statistics teacher wants to know what her students think about the introductory statistics class. She administers a survey to a random sample of students taking the class. If she randomly selects a class period and surveys every student in that class period, what sampling method does she use?
Cluster Sampling
300
What's the median of the following data?
32
300
Classify the variable for a survey of where people live which is categorized by postal zip codes.
a) nominal
b) ordinal
c) interval
d) continuous
a) nominal
400
Find the IQR
How is it skewed, if the mean is 32?
IQR = 44-23 = 21
Skewed Left
400
Two swimmers, Angie and Beth, from different teams, wanted to find out who had the fastest time for the 50 meter freestyle when compared to her team. Which swimmer had the fastest time when compared to her team?
Angie was faster compared to her team
400
A mayor divides her city into ten similar blocks and sends out her team to survey everyone in one of the blocks chosen randomly. What sampling procedure has she employed?
Cluster Sampling
400
Make a Stem and Leaf Plot of the following dataset:
1.1; 1.5; 2.3; 2.5; 2.7; 3.2; 3.3; 3.3; 3.5; 3.8; 4.0; 4.2; 4.5; 4.5; 4.7; 4.8; 5.5; 5.6; 6.5; 6.7; 12.3
400
In a survey prior to a midterm election, potential voters were asked their age, their gender, their marital status, their party affiliation, their zip code, their income, the number of children in their household, estimated mileage driven per week, and their willingness to pay an additional $0.05 per gallon tax to help fund infrastructure maintenance and repair. For how many numerical variables did the survey seek data?
4
age, income, number of children, and estimated mileage
500
Make a box plot for the following dataset:
Twenty-five randomly selected students were asked the number of movies they watched the previous week. The results are as follows:
The median is also Q1
500
Identify the range of the data
What is 272 - 193 = 79
*the RANGE is all of the data
*the IQR is the range of the middle 50%
500
What is the main difference between a strata and a cluster?
Strata are groups with similar attributes (homogeneous) such as grade level, hair color, or gender. Clusters are random (heterogenous).
When sampling with strata, select from every group. When sampling with clusters, entire groups are selected.
500
Consider the following data:
3, 5, 2, 6, 5, 9, 5, 2, 8, 6
What is the mean?
5.1
500
A survey is done at a dog boarding facility. The following data is collected about the dogs they house. Which data is categorical?
- weight
- age
- number of days housed
- veterinary costs
- breed
Breed