Measures of Center
The number that appears most often in a set of data is called what
Mode
Find the range of the following data: 40, 45, 44, 39, 49, 53, 25, 38
Range: 28
Each student's name is put into a drawing exactly one time. 100 names are drawn for the sample. What type of sample is this? Is it biased or unbiased?
Simple random sample, unbiased
50 students are interviewed about their favorite ice cream flavor. 20 students chose vanilla if there were 100 students how many would you expect to pick vanilla?
40 students
Find the median of the following data: 11, 17, 17, 21, 22, 25, 44, 52, 60, 65
Median: 23.5
What is the Q1 and Q3 and how do you find them?
First quartile and third quartile. They are the medians of the lower and upper half of the data
At 5pm, the people at the dog park are surveyed about what they like best about the city. What type of sample is this? Is it biased or unbiased?
Convenience sample, biased
A phone manufacturing company randomly picks 50 phones to test and finds that 5 are defective. If there were 1000 phones how many would be defective?
100 phones
Find the mean of the data for time spent biking in minutes: 34, 30, 45, 30, 40, 38, 28 (HINT: don't forget your label)
35 minutes
Find the median, first quartile, and third quartile of the following test scores: 72, 72, 74, 75, 75, 77, 77, 79, 79, 79, 79, 80, 80, 82, 83, 83, 83, 86, 86, 88
Median: 79
Q1: 76
Q3: 83
Ms. G posted a survey in google classroom. What type of sample would this be? Is it biased or unbiased?
Voluntary Response Sample, biased
100 students were surveyed, about their favorite dog breed, and 30 chose Husky. If there were 2000 students, how many would choose husky?
600
Find the mean, median, and mode of the data: 40, 37, 45, 19, 49, 50, 46 (round to the nearest whole number)
Mean: 41
Median: 45
Mode: none
Find the interquartile range (IQR) of the following data: 12, 13, 14, 16, 18, 22, 23, 25, 28, 31
IQR: 11
Every 20th person that enters Target is surveyed. What type of sample is this? Is it biased or unbiased?
Systematic random sample, unbiased
30 out of 200 people surveyed said their favorite color is orange. If there were 500 people, how many people would like orange best?
75 people
Find the mean, median, and mode of the data: 18, 21, 18, 29, 44, 49, 38, 32 (round to the nearest tenth)
Mean: 31.1
Median: 30.5
Mode: 18
Find all the measures of variability (Range, Median, Q1, Q3, IQR) of the data: 15, 17, 18, 18, 20, 21, 22, 23, 25, 25, 27, 30
R: 15, M: 21.5, Q1: 18, Q3: 25, IR: 7
All of the students are separated into 4 groups based on what season they were born in (fall, winter, spring, summer) and then 5 people from each group were randomly chosen to take a survey. What type of sample is this? Is it biased or unbiased?
Stratified random sample, unbiased
50 people were randomly surveyed in the movie theatre to find out their favorite movie snack. 30 chose popcorn. If there were 600 people how many popcorn boxes should they get?
360 boxes