Collecting Data
What are 5 methods of collecting data?
Interview, Questionnaire, Observation, Experiment
What are two times of data?
Discrete and Continuous
What is the name of the table used to gather data?
Frequency table
What are 3 types of Averages?
Mean, Median and Mode.
What is the median temperature (Celsius) in Chicago over 2 weeks?
7 4 4 5 8 8 8
6 6 4 4 4 -2 0
4.5 C
Data collection method of recording things that you see.
Observation
Data that can only have exact values, such as the number of pineapples in a box.
Discrete Data
Class, Tally, and Frequency.
What is the measure of how spread out the numbers collected are?
Range
Which data collection method would you use to find the number of pairs of shoes owned by students in your class?
Survey
Asking people questions yourself.
Interview
Data that can take any value within a range, such as the weight of all the pineapples in a box.
Continuous Data
What masses (m) can fit inside this class:
60kg < m ≤ 70kg
61kg to 70kg.
Remember that 60kg cannot be included because the symbol after 60kg is less than (<) not less than or equal to (≤)
What is the middle value when all values are put in order?
Median
What is 7% of 30
2.1
Mia runs a rollerskating club. She wants to ask the members of the club if they would like to have training on a Wednesday evening. There are 38 members. How many members should she ask and why?
She needs to ask them all as 38 is too small of a group to use a 10% sample.
True or False: I have asked 10 people the size of the shoes they wear. My results are 6, 6 1/2, 8, 9, 10 1/2, 7 1/2, 8, 6 1/2. This is continuous data as the values are not whole numbers.
False. Shoes are sold in these set sizes.
In statistical tables, we have 4 categories. What are they?
Class, Midpoint, Frequency, m x f
This table shows the age of 50 members of a club. What is the mean age?
Age 11 12 13 14 15 16
Frequency 10 21 8 5 3 3
12.58 years old.
(11x10) + (12x21) + (13x8) + (14x5) + (15x3) + (16x3) = 629
629/50 members = 12.58 years old
What is information that is true because the question tells you it?
a Given
There are 948 students at Gaylussac. Professor KC wants to know if the students would prefer to have their break at 2:10pm or 3:00 pm. He decides to ask a sample of the school population. How many students should he ask and why?
He should ask 95 students as that would be 10% of 948. (94.8-->95 students)
True or False: I have asked 10 people their ages. My results are 23, 25, 22, 18, 36, 42, 12, 15, 17, 20. This is discrete data as the values are whole numbers.
False. Age, like time, is measured so it is Continuous.
Explain the meaning of equal class intervals
Example) Xkg < m ≤ Ykg
The class Xkg means any mass from Xkg (but not including Xkg), up to AND INCLUDING Ykg
What is the mode average of the following data?
12kg, 15kg, 14kg, 17kg, 14kg, 17kg, 14kg, 20kg, 21kg, 14kg, 17kg
A Proof