Sampling and Questioning
A sample includes only students from the basketball team to represent the a schools's favorite sport. Is this biased or not biased?
Biased
Find the mean: 5, 10, 7, 8, 5
7
Find the range: 2, 5, 6, 7, 9
7
Probability of flipping heads on a fair coin
1/2
Experimental probability is based on:
a) Theoretical math
b) actual results
B
What color are Rachel's eyes? Is this a statistical question?
NO
Find the median: 3, 5, 7, 9, 12, 18
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
6
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 flipping a coin and landing on heads and landing on a number less than 5 on a number cube?
1/3
You roll a die 30 times and get a 6 five times. What is the experimental probability of landing on a 6?
1/6
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