Is it biased?
Off the charts
Just 2 Whiskers?
Likelihood & Simple Events
Is that your theory?
That's your uniform?
100
A clothing store, Forever 22, wants to know about how many people go to Forever 22 in the mall in comparison to other stores in the mall. So they asked every 10th person entering the mall. Is this bias or valid?
What is valid?
This is systematic random. Asking at the mall is appropriate since that is where any potential customers would be. If they were asking people already at their store, THEN it would be biased.
100
Kyla wants to know how many 7th grade students have their own cell phone. She surveys 40 students, and 32 of them own a cell phone.
If there are 500 7th graders, this is the amount that you would expect to own a cell phone.
What is 400?
100
Braeden went to one of the above restaurants and purchased a meal for $10. This is the restaurant Braeden most likely went to.
What is the Red Brick Grill?
100
The probability of winning a specific game is 0.82. Which word describes the likelihood of this event?
What is likely?
0.82 = 82% = 82/100
100
What is expected/ predicted to happen in a probability question.
What is theoretical probability?
100
The type of probability that best describes a model where each event is equally likely.
What is uniform probability model?
200
A Student wants to know who the favorite teacher is in their pod. They survey their 2nd period. Biased or representative?
What is Biased
200
Akinah surveys 21 Georgians to see what their favorite color is. The results are recorded in the table below.
Out of a group of 65, about how many Georgians would you expect to choose yellow as their favorite color?
What is 9 people/Georgians?
(9.28 is the calculated answer, but we round to 9 since the question is asking about the number of people. You cannot have 0.28 people)
200
Which of the following is a true statement?
A) Ladybugs tend to be longer
B) Beetles vary more in size
C) All beetles are larger than all ladybugs
D) There were less ladybugs in the sample
What is B?
The box plot for Beetles is much larger, indicating a larger variance/spread.
200
A spinner has 6 equal sections, red, blue, yellow, green, orange, and pink. This is the probability that the spinner will land on yellow or red.
What is 1/3?
200
Mia tosses a coin and gets heads 7 times out of 20. 7/20 best describes this type of probability.
What is experimental?
200
A die (number cube) is an example of a _____________ probability model.
What is uniform?
300
A lemonade stand wants to know how many people get or drink lemonade. So, every person that goes to the stand will be surveyed.
What is Biased
300
What is the mean of the data?
111/20 = 5.55
300
Which of the following is true?
A) The restaurants have the same range of prices
B) The meals at Red Brick are more expensive
C) The restaurants have the same median price
D) The restaurants have the same interquartile range of price
What is D?
(Recall: the IQR/interquartile range is Q3-Q1, this it the length of the "box" ) Both restaurants have an IQR of 2.
300
A spinner has 10 equal sections, 1,2,3,4,5,6,7,8,9, and 10. If the spinner is spun, this is the probability of spinning a number less than 7.
What is 3/5?
300
Joshua is conducting an experiment and calculating the experimental probability of flipping a coin and landing on heads. Which amount of times should Joshua flip the coin so that his experimental probability is closest to the theoretical?
A) 2 B) 10 C) 30 D) 300
What is D - 300
*Remember, you always want to do it the most times. The more times you conduct an experiment, the closer your probabilities will be.
300
What type of probability model is shown?
Non-uniform
P(green) > P(yellow)
400
A Girl (4th grader) wants to know about how many girls in 7th grade wear make-up at Five Forks. So, she surveyed every 5th 7th grade girl from a roster of the 7th graders in the school. Valid or biased?
What is valid?
400
What is the median of the data?
Median = 6
400
This is the average median temperature for spring and summer temperatures.
What is 75?
(80+70)/2=150/2=75
400
A standard die is rolled.
This is the probability of landing on a number which is a divisor of 6.
What is 2/3?
400
William flips a coin 20 times and only lands on heads 6 times.
True or False: William will most likely land on heads next.
What is false? William is as likely as not to land on heads.
400
This describes the type of probability model shown.
What is non-uniform?
500
Chase wants to know about how many people in his community play sports. So, he surveyed every 5th person who enters a sports store. Biased or representative?
What is Biased?
Though it is systematic, he is at a SPORTS STORE asking if they play a sport; so they are more likely to say yes.
500
What is the range of the data?
9
10 - 1=9
500
Which statement will not always be true about data summarized in the plots?
A) The data shows the same median.
B) The data shows the same range.
C) The data shows the same upper quartile.
D) The data shows the same mean.
D)
We cannot determine the mean of either data set. We can only estimate the means would be near the median of 12, but most likely not the same. The data sets have different lower quartiles as well.
500
This word best describes the likelihood of landing on a prime number when rolling a number cube.
What is "as likely as not" or "equally likely"?
Prime numbers on a dice: 2, 3, 5
P(prime) = 3/6 = 1/2
500
The table below shows the results of a spinner with 5 equal sections. Compare the experimental and theoretical probabilities of spinning a 5. Which is larger?
What is the theoretical probability is larger?
Theoretical probability = 1/5 = 0.2 = 20%
Experimental probability = 38/200 =0.19=19%
500
True or False? YOU MUST BE ABLE TO EXPLAIN
Spinner A has the sample space: green, yellow, and blue.
Spinner B has the same sample space.
If spinner A is a uniform probability model, then spinner B must also be a uniform probability model.
FALSE!
Spinner B could have 2 greens, 1 yellow, and 1 blue section which would not be uniform, but spinner A could have 1 green, 1 yellow, and 1 blue which IS uniform.