Vocabulary
more likely to be a representative than a sample
Random sample
Mia wants to know what adults favorite sport in her hometown. So she decides to survey 50 people at the basketball game. Is this a biased or random sample?
Biased sample
24, 31, 12, 38, 12, 15, 43, 21, 54
LV: Q1: Median: Q3: HV:
24, 31, 12, 38, 12, 15, 43, 21, 54
LV:12 Q1:13.5 Median: 24 Q3: 40.5 HV:54
Is this a statistical or non-statistical question.
What is my height?
non-statistical question
If you roll a dice that has six sides, what is the probability of it landing on a 4.
1/6
when a sample does not do an accurate representation of the population
Biased sample
Grace wanted to know if the favorite type of music for students in her class. She puts all of the names of the students in a brown bag. She draws 8 names and survey those students. Is this biased?
It isn't biased, this is random
5, 28, 16, 32, 5, 16, 48, 29, 5, 35
LV: Q1: Median: Q3: HV:
5, 28, 16, 32, 5, 16, 48, 29, 5, 35
LV:5 Q1:5 Median:22 Q3:33.5 HV:48
Is this a statistical or non-statistical question.
How much do the animals at the farm weigh?
statistical question
A box contains 5 orange crayons and 13 purple ones. Bryce selected one crayon at random from the box. what is the probability he picks an orange crayon?
5/18
The mean distance between each data value and the mean of the data set.
Mean Absolute Deviation(MAD)
Bartholomew asks the first 5 students he sees leaving school if they prefer nike or adidas. Is this a biased or random sample
This is random
53, 13, 34, 41, 26, 61, 34, 13, 69,43,98
LV: Q1: Median: Q3: HV:
53, 13, 34, 41, 26, 61, 34, 13, 69, 43, 98
LV: 13 Q1:26 Median:41 Q3:61 HV:98
Which is not a statistical question
How old am I?
How old are the students in the seventh grade?
How old am I?
A bag contains 22 green marbles and 19 purple marbles. You select one marble at random from the bag. What is the probability that you select a green marble?
Green marbles (22) + Purple marbles (19)= Total (41)
P(green marble)= number of green marbles/ total of marbles
19/41, or 0.46, or 46.34%
The ratio of the number of times an event occurs to the total number of trials, or times the activity is performed
Experimental probability-
Cats are the most independent and the most easiest pets to take care of what is your favorite pet? is this a unbiased or biased question?
This is biased.
85, 58, 72, 85, 46, 93,23,64,13,78
LV: Q1: Median: Q3: HV:
85, 58, 72, 85, 46, 93,23,64,13,78
LV:13 Q1:34.5 Median:68 Q3:85 HV:93
Which is a statistical question?
How tall, in inches, was Earl on his last birthday
How tall are Earl and his friends, in inches?
How tall are Earl and his friends, in inches?
A pizzeria offers thin, thick, and traditional style pizza crust. People are able to get pepperoni, sausage, mushrooms, onions, or peppers for there toppings. people who order can only order one-toppings pizza. How many outcomes are in the sample space
3x5=15
15 outcomes
the probability that a event occurs when all of the outcomes of the experiment are equally likely.
Theoretical probability
Basketball and Baseball are two very popular sports. Do you prefer basketball or baseball? Is this a biased or unbiased question
This is unbiased
72, 43, 15, 66, 32, 72, 52, 19, 28, 81
LV: Q1: Median: Q3: HV:
72, 43, 15, 66, 32, 72, 52, 19, 28, 81
LV:15 Q1:23.5 Median:47.5 Q3:72 HV:81
Which one is not a statistical question
Does Emmanuel weigh more than 85lbs?
How does the weight of Emmanuel and his classmates compare to each other?
How does the weight of Emmanuel and his classmates compare to each other?
What is the experimental probability of the cup landing open-end down?
Tossing a cup 20 times:
Upside down: 7
Right side up: 0
On its side: 13
Open-end down/20
7/20= 0.35
Answer: 0.35