Sampling
Which of the following is a random sample of students at your school?
A. 10 girls
B. 10 of your friends
C. 10 names picked from a hat
C. 10 names picked from a hat
Sadie is comparing the daily high temperatures in two big cities.
Seattle: 69, 73, 75, 66, 62, 57, 67
San Francisco: 63, 60, 64, 62, 64, 67, 71
What is the mean temperature for Seattle?
67 degrees
Sadie is comparing the daily high temperatures in two big cities.
Seattle: 69, 73, 75, 66, 62, 57, 67
San Francisco: 63, 60, 64, 62, 64, 67, 71
Which description best compares the two data sets?
A. Both data sets have the same mean.
B. Seattle has the higher mean.
C. San Francisco has the higher mean.
B. Seattle has a higher mean.
Which of the following events has the greatest theoretical probability?
A. Rolling a 5 on the number cube labeled 1-6.
B. Flipping a coin and having it land tails up.
C. Spinning a 7 on a spinner with 5 sections labeled 2, 4, 6, 8, and 10.
D. Pulling a green ribbon randomly from a bag with 1 red, 1 yellow, and 3 green ribbons.
D. Pulling a green ribbon randomly from a bag with 1 red, 1 yellow, and 3 green ribbons.
Which of the following is a biased sample of the houses in you neighborhood?
A. 20 houses randomly from a complete directory.
B. 20 houses generated randomly by a computer program.
C. 20 houses randomly selected that have newspapers delivered.
D. 20 houses randomly selected from a map of the neighborhood.
B. 20 houses generated randomly by a computer program.
Sadie is comparing the daily high temperatures in two big cities.
Seattle: 69, 73, 75, 66, 62, 57, 67
San Francisco: 63, 60, 64, 62, 64, 67, 71
What is the mean temperature for San Francisco?
64.4 degrees
The data show the number of floors in apartment buildings in two different neighborhoods.
Neighborhood A
21, 24, 36, 18, 35, 15, 12, 16, 14, 28
Neighborhood B
7, 4, 8, 10, 5, 8, 4, 6, 3, 5
Which of the following describes the relative mean variability of the data for Neighborhood A as compared to the data for Neighborhood B?
A. both are relatively high
B. both are relatively low
C. the mean is relatively high and the variability is relatively low
D. the variability is relatively high and the mean is relatively low.
B. both are relatively low
Owen spins a spinner with the numbers 1-4 on it two times.
What is the probability he will land on the number 1 with the first spin and the number 2 with the second spin?
A. 1/16
B. 1/12
C. 1/8
D. 1/4
A. 1/16
Some students are taking surveys to find out if people will vote to fund the building of a new city park on election day. Which student is taking the most representative sample?
A. Natalie asks 20 parents of her friends.
B. Dylan asks every other person leaving the library until he has asked 20 people.
C. Sam calls 20 randomly selected registered voters.
D. Chris sends e-mails to 20 friends.
C. Sam calls 20 randomly selected registered voters.
Sadie is comparing the daily high temperatures in two big cities.
Seattle: 69, 73, 75, 66, 62, 57, 67
San Francisco: 63, 60, 64, 62, 64, 67, 71
The mean temperature for Seattle is how many degrees warmer than San Francisco?
2.6 degrees
The data shows the number of floors in apartment buildings in two different neighborhoods.
Neighborhood A
21, 24, 36, 18, 35, 15, 12, 16, 14, 28
Neighborhood B
7, 4, 8, 10, 5, 8, 4, 6, 3, 5
Which of the following best describes the overlap in the data sets?
A. no overlap
B. slight overlap
C. moderate overlap
D. complete overlap
A. no overlap
Brandy has a bag with 3 yellow, 4 red, and 5 blue marbles. Brandy will pick 2 marbles from the bag, one at a time without looking. She will not replace a marble before picking the next marble. What is the probability of Brandy picking a red marble, followed by a yellow marble?
A. 1/12
B. 1/11
C. 7/12
D. 1/2
B. 1/11
A random sample is taken of people who have bought tickets for a concert. In the sample, 13 out of 150 say they will contribute $5.00 toward a music scholarship for a local high school student. If 3, 00 people come to the concert, approximately how much money will be raised for the scholarship?
A. About $300
B. About $700
C. About $1,300
D. About $1,500
A. About $300
Sadie is comparing the daily high temperatures in two big cities.
Seattle: 69, 73, 75, 66, 62, 57, 67
San Francisco: 63, 60, 64, 62, 64, 67, 71
What is the interquartile range for Seattle?
11
Austin's neighborhood started two clubs, one for movies and one for books. The ages of the book club members are 48, 27, 32, 56, 59, 43, 39, 28, 28, 42, 71, and 55 years. The ages of the movie club members are 24, 27, 18, 26, 34, 32, 42, 45, 16, 23, 19, and 30 years. What is the range of the overlap between the two sets of data?
A. Between 18 and 45 years of age
B. Between 18 and 71 years of age
C. Between 27 and 45 years of age
D. Between 27 and 71 years of age
C. Between 27 and 45 years of age
A bag holds 1 black ribbon, 3 blue ribbons, and 4 pink ribbons. Emma pulls a colored ribbon from the bag and does not replace it. She then draws a second ribbon.
How man outcomes are possible?
A. 5
B. 6
C. 8
D. 9
B. 6
Parents of students at a middle school were randomly selected to participate in a survey. Forty-two out of 60 parents who were surveyed support a proposal to buy new computers. There are a total of 456 parents with students at the middle school. Which is the best estimate of the number of those parents likely to support the new proposal?
A. 182
B. 319
C. 365
D. 438
B. 319
Sadie is comparing the daily high temperatures in two big cities.
Seattle: 69, 73, 75, 66, 62, 57, 67
San Francisco: 63, 60, 64, 62, 64, 67, 71
What is the interquartile range for San Francisco?
5
Austin's neighborhood started two clubs, one for movies and one for books. The ages of the book club members are 48, 27, 32, 56, 59, 43, 39, 28, 28, 42, 71, and 55 years. The ages of the movie club members are 24, 27, 18, 26, 34, 32, 42, 45, 16, 23, 19, and 30 years. How do the medians of each data set compare to the overlap in the data sets?
A. Neither median is included in the overlap.
B. Only the median age of the book club members is included in the overlap.
C. Only the median age of the move club members is included in the overlap.
D. Both medians are included in the overlap.
D. Both medians are included in the overlap.
For each situation, tell whether the situation is unlikely, likely, or neither likely nor unlikely.
A. Drawing a 10 from a bag with 100 slips of paper numbered 1-100.
B. Rolling a number less than 5 on a number cube labeled with the numbers 1-6.
C. Drawing a red marble from a bag containing 8 red and 8 blue marbles.
A. Unlikely
B. Likely
C. Neither likely nor unlikely