Vocabulary
This is the middle number of the data when it is put from least to greatest.
Median
This is the number that shows up the most amount of times in a data set.
Mode
This is the difference between the maximum and minimum numbers in a data set.
Range
A museum employee surveys a random sample of 350 visitors to the museum. Of those visitors, 266 stopped at the gift shop. Based on these results, about how many people out of 2,300 visitors to the museum would be expected to stop at the gift shop?
1748 people
Look at google slide #3 for question.
B) The second period class scores had a higher mean than the first period class scores.
The "Average" of the data set.
Mean
What are the 3 measures of center?
Mean, Median, & Mode
This is the difference between the third and first quartile.
Interquartile Range
A school principal wants to determine which type of elective courses the 7th grade students would like to have in the next school year. Which survey method would produce the best representative sample?
A) survey all 7th grade students in NJHS
B) survey every fifth 7th grader who enters the school one morning
C) survey all of the students who went to the last basketball game.
D) survey every sixth student entering the school one morning
B) survey every fifth 7th grader who enters the school one morning
A bowling team participates in a two day tournament and records the scores for each team member on both days. The scores for both days are represented by the box plots below.
Look at google slide #4 for question.
D) The scores on Friday have a greater median than the scores on Saturday, but both data sets have the same interquartile range.
The whole group being studied.
Population
The height of players on Team A(in inches) are shown:
76, 68, 73, 65, 60, 63, 69, 76
What is the mean height of Team A?
68.75in
What are the 5 measures of variability that are needed in order to create a box plot?
Min, Q1, Median, Q3, Max
An assistant principal wants to know what each students' favorite subject is. Which sample would be the most appropriate for this survey?
A) 7 girls in each class
B) every fifth student walking into each grade level lunch periods
C) every 6th student walking into history class
D) all of the boys in the eight grade
B) every fifth student walking into each grade level lunch periods
A principal gathered data about the distance, in miles, that his teachers and bus drivers live from the school. The box plot below show these data.
Look at google slides #5
C) The interquartile range of the distances for the bus drivers is 5 miles less than the interquartile range of the distances for the teachers.
This is a small portion of your population that is RANDOMLY selected and represents everyone in the population.
Representative Sample
The height of players on Team A(in inches) are shown:
76, 68, 73, 65, 60, 63, 69, 76
What is the median height of Team A?
68.5 in
Given the box plot on google slide #2. Give the following values:
Min, Q1, Median, Q3, Max, Range, and IQR
Min= 20
Q1= 36
Median= 56
Q3= 76
Max= 92
Range= 72
IQR= 40
The results for a survey of 120 students who were selected randomly are listed below.
60 students have a cell phone plan with company X
36 students have a cell phone plan with company Y
24 students do not have a cell phone
The total population of students was 380. Based on the data, what is the best approximation for the total number of students who do not have a cell phone plan.
A) 76
B) 114
C) 190
D) 163
A) 76
The height of players on Team A and Team B(in inches) are shown:
Team A: 76, 68, 73, 65, 60, 63, 69, 76
Team B: 63, 73, 64, 70, 70, 67, 75, 62
Which answer choice does not show the comparison between the heights on Team A and Team B?
A) The mode of Team A < The mode of Team B
B) The mean of Team B < The mean of Team A
C) The mode of Team B < The mean of Team A
D) The mean of Team A > The mean of Team B
A) The mode of Team A < The mode of Team B
This is the study of data: it can be collected, analyzed, summarized and presented.
Two math classes took the same test. The scores of 8 randomly selected students from each class are listed below.
Class A: 40, 63, 90, 100, 75, 13, 28, 78
Class B: 95, 58, 60, 63, 90, 83, 100, 93
Based on the averages(Rounded to the nearest whole) of the scores for each class, what inference can you make about the mean test scores of all the students in Class A compared to all the mean test scores of the students in Class B?
The mean test scores in Class A are much lower than the mean test scores in Class B. This is because in Class B there were more higher values than in Class A and also in Class A there are as low as a 13 and 28 that will drop the mean value in a big way.
Create a box plot with the data shown:
3, 3, 3, 7, 8, 11, 12, 12, 14, 14, 15, 15, 16, 17
On board
Sophie owns a small business selling clothing. She surveyed her customers the last week about they preferred method of payment. The results were that 122 customers paid cash, 10 customers used a debit card, and 8 customers used a credit card. If next week, she is expecting 200 customers, about how many would you expect to pay with a debit card? Round to the nearest whole number.
About 14 people
The height of players on Team A and Team B(in inches) are shown:
Team A: 76, 68, 73, 65, 60, 63, 69, 76
Team B: 63, 73, 64, 70, 70, 67, 75, 62
Which answer choice shows the comparison between the heights on Team A and Team B?
A) The mean of Team A < The mean of Team B
B) The median of Team B > The median of Team A
C) The mean of B < The mean of Team A
D) The median of A < The median of Team B
C) The mean of B < The mean of Team A