Samples and Population
Out of 200 workers, 15 are chosen to complete a survey about the number of miles they drive to work this week. Which is the sample? Which is the population?
15 is the sample; 200 is the population
Ten students are randomly selected to participate in a survey about home computer usage.
No, Unbiased, random
Find the range: 14, 20, 22, 21, 15, 54, 12, 18, 28
What is the best measure of central tendency?
Range: 42
Median is the best measure of central tendency because an outlier exists.
List the following percents for a box and whisker chart:
a. from Q1 to the median
b.from min to Q3
c. from max to median
d. from min to max
a. 25%
b. 75%
c. 50%
d. 100%
Factor the following expression correctly:
14x+35
7(2x+5)
50 students are surveyed about what is there favorite NFL team. 12 say the Philadelphia Eagles, 22 say the New York Giants, 5 say the Los Angeles Rams, and 11 say the Buffalo Bills. What percent of the students favorite team are the Eagles.
24%
Every fortieth student who enters the school is asked to name their favorite sport.
No, Unbiased, systematic
Calculate the mean: 18, 20, 4, 17, 12, 25, 8, 7, 10,2
12.3
From the stem and leaf chart, find the measures of variation (IQR and Range)
IQR is 12, Range is 29
Determine if the following table is proportional or nonproportional
x 12. |. 9 |. 15. |. 18
y 4. |. 3 |. 5. | 6
Proportional
You want to determine if there should be a swimming pool in your school. You survey every 5th person who walks out of the school at the end of the day. Is this biased or unbiased?
Unbiased because it is random and a large population
A phone-in survey is taken by a radio station to see how many listeners enjoy jazz in the morning
Yes, Biased, response are only from listeners who decide to call in
90
Find the mean absolute deviation for the following data set 12, 14, 18, 23, 23, 25, 32, 35
6.0625
Last year there were 520 students enrolled at Camp Avenue Elementary School. This year there were 572 students enrolled. What is the percent of increase?
10%
There are 35 dogs and 42 cats at the local animal shelter. What percent of cats are there? Round to the nearest whole number.
55%
A shirt manufacturer wants to check quality control of their products. The plant manager decides to check every 5th shirt inspected by Inspector D. There are 15 inspectors in the plant.
Yes, Biased, only Inspector D’s shirts are being checked
Calculate the median 20, 16,22,14,4,8,26,28, 2, 10
15
Create a box and whiskers chart with the following data set 4, 16, 24, 21, 7, 22, 8, 9, 14
Median: 14
Max:24
Min:4
Q1:7.5
Q3: 21.5
A family went on a sleigh ride in Central Park. The ride lasted 8/3 minutes and the sleigh traveled 4/5 miles. Calculate the unit rate of the sleigh ride in miles per minute.
3/10
Create an example of a biased and unbiased scenario. Explain your reasoning for both.
answers will vary
A survey is conducted at the local shopping mall about household products used on a daily basis.
Yes, Biased, only customers at the shopping mall have an opportunity to be surveyed
Using this data set (5,13,7,11,9,17,3), calculate the mean, median, Q1, Q3, and IQR. round to the nearest tenth if necessary
Mean:9.3
Median: 9
Q1:5
Q3:13
IQR: 8
Create a dot plot for the following data set. List the mean, median, mode, and range. 4,4,5,5,6,6,6,6,7,7,7,7,7,8,8,8,8,9,9,10
Mean: 6.85
Median: 7
Mode:7
Range: 6
Maria has 300 pennies and 450 nickels in her coin jar. What percent of the jar is made up of pennies?
40%