Random Samples
Making Inferences/Predictions
Measures of Center
Measures of Variability
Comparing Data Displays
100
What makes a random sample valid?
Every person in the population has the same fair chance
100
Bryan surveyed 20 people about if they have been to a Grizzlies game. 15 people said they have been to a game. What proportion of the people surveyed have been to a game?
(Express as a decimal)
0.75
100
The prices of some of the sandwiches at Firehouse Subs are listed below:
$4.99, $5.49, $5.79, $6.39, $7.29, $5.59
What is the median of the sandwich prices?
$5.69
100
The prices of some of the sandwiches at Firehouse Subs are listed below:
$4.99, $5.49, $5.79, $6.39, $7.29, $5.59
What is the range of the sandwich prices?
$2.30
100
Which of these shows a greater variability (range)?
Whales Seen on Morning Trips
200
What kind of sample is one that does not give everyone in the population the same fair chance or is not truly random?
Biased or unbiased?
Biased sample
200
There are 25 students in your math class. 18 of them have brown hair. How many students can we predict have brown hair if there are 630 students in the entire school?
About 454 students
200
The points scored by Zion Williamson in the last 11 games are listed below:
29, 28, 25, 32, 31, 21, 20, 21, 24, 14, 21
What is the mode of the points scored by Zion Williamson over the past 11 games?
21
200
The points scored by Zion Williamson in the last 11 games are listed below:
29, 28, 25, 32, 31, 21, 20, 21, 24, 14, 21
What is the range of the points scored by Zion Williamson over the past 11 games?
18
200
Which of these has a greater mean?
Whales Seen on Afternoon Trips
300
What kind of sample is everyone in the population given the same fair chance of being selected?
Biased or unbiased?
Unbiased
300
Dean surveyed 50 people in his church to see what types of movies are people's favorite in his church, and 30 said comedy movies. If his church has 400 people, how many people could be predicted for their favorite movie type to be comedy?
240
300
The points scored by Zion Williamson in the last 11 games are listed below:
29, 28, 25, 32, 31, 21, 20, 21, 24, 14, 21
What is the median of the points scored by Zion Williamson over the past 11 games?
24
300
The points scored by Zion Williamson in the last 11 games are listed below:
29, 28, 25, 32, 31, 21, 20, 21, 24, 14, 21
What is the interquartile range (IQR) of the points scored by Zion Williamson over the past 11 games?
8
300
Which of these towns has a greater range of time traffic lights are red?
Martinville
400
Which method would give a valid random sample of the entire school?
Giving a unique number to every student in the school and randomly select 50 using a number generator
Randomly select 50 students from the art classes
Randomly choose 50 students getting off the bus
Giving a unique number to every student in the school and randomly select 50 using a number generator
400
Jen surveys 20 of the 200 7th grade students. Of the 20 students surveyed, 8 prefer watching movies for Fun Friday. Based off of this survey, how many 7th grade students would you predict prefer watching movies on Fun Friday?
80
400
16, 17, 19, 20, 27, 15, 21, 12, 16, 18
What is the mean of the points scored by Ja Morant over the past 10 games?
18.1
400
The number of runs scored by the Washington Nationals in the World Series are listed below:
4, 5, 6, 6, 9, 12
What is the mean absolute deviation (MAD) of the scores?
2.33
400
Which of these towns generally has traffic lights that are red longer?
Johnstown
500
Which of these methods would reflect a random sample of the 7th grade?
Picking 10 friends
Asking every 5th person coming into the school
Asking every 3rd 7th grader coming into the cafeteria
Asking every 3rd 7th grader coming into the cafeteria
500
Stanley wanted to see how interested students at his school were in starting a baseball team. He surveyed 70 students and 40 of them said they would be interested. If there are 560 students in the school, how many could you predict are interested in starting a baseball team?
320
500
The points scored by Ja Morant in the last 10 games are listed below:
16, 17, 19, 20, 27, 15, 21, 12, 16, 18
What is the median of the points scored by Ja Morant over the past 10 games?
17.5
500
The number of runs scored by the Houston Astros are listed below: 1, 2, 4, 6, 8, 1
What is the mean absolute deviation (MAD) for the Astros?
2.83
500
Which town has a greater interquartile range?
Martinville