Sampling and Inference
A sample includes only students from the basketball team to represent the whole school. Is this biased or unbiased?
Biased
Find the mean: 4, 6, 8
6
Find the range: 2, 5, 9
7
Probability of flipping heads on a fair coin
1/2
Experimental probability is based on:
a) Theoretical math
b) actual results
B
A random sample means:
a) picking your friends
b) everyone has an equal chance
c) only picking high scores
B
Find the median: 3, 5, 7, 9
6
What does the "spread" describe?
How far apart the data values are
Probability of rolling a 3 on a fair die
1/6
A coin is flipped 10 times, heads occurs 6 times. What is the experimental probability of landing on heads?
3/5
A survey of 50 students show 30 like pizza. Predict how many out of 200 students like pizza.
120
Which measure is better to use when there is an outlier: mean or median?
Median
Two data sets have the same median, but one has a larger range. Which is more spread out?
The one with the larger range
If probability = 0.9, is this event likely or unlikely?
likely
As trials increase, experimental probability gets closer to what?
Theoretical probability
Why are random samples better than convenience samples?
Data: 2, 2, 3, 4, 20.
Which is larger,mean the mean or median?
mean
If all values increase by 5, what happens to the range?
Stays the same
What probability represents an impossible event?
0
You roll a die 30 times and get a 6 five times. What is the experimental probability of landing on a 6?
1/6
An unbiased sample says average screen time is 6 hours. What can you do with this information?
Make an inference/prediction about the population.
When you use the Median to measure the center, what do you use to measure the spread?
IQR (interquartile range)
A new high value is added to a data set. What happens to the range?
Increases.
What probability represents a certain event?
1
Why might experimental probability differ from theoretical probability?
Random variation/ not enough trials/ not a perfect world