Sample Vs Population
A poll is taken from 100 seniors in a high school where the senior class has 575 students. Who took the poll, a sample or population?
Sample
Which will produce a more representative sample of a company? Surveying the 50 newest hires or surveying every other people on an alphabetical list?
Every other person on a list
3 out of every 5 students survey reported that they play are enrolled in an afterschool sport. Based on this statistic how many people could the school infer will enroll in afterschool sports out of the 600 total students in the school?
360 students
What is the mode in the set of data?
2,2,2,4,4,5,6,6,6,7
2 and 6
A group of librarians is interested in the numbers of books and other media that patrons check out from their library. They examine the checkout records of 150 randomly selected adult patrons. What is the population and sample?
Population: patrons of the library
Sample: 150 randomly selected adult patrons
A company wants to interview 10 employees from a company of 600 employees about their experience with the company. Explain whether this will produce a representative sample, why or why not?
Interviewing 10 people from the accounting apartment
It will not, they are not getting the opinion of the other departments
A survey of a middle school shows that 7 out of every 20 students will choose pizza for lunch given the option. Based on this statistic, what percent of students could the school infer will choose pizza for lunch?
35%
What is the mean of the following numbers?
10, 39, 71, 39, 76, 38, 25
42.57
A new cable TV station wants to study the viewing habits of households in New York. The station surveys every household that purchased a new TV within the last 2 years in New York. What is the population and what is the sample?
Population: households in NY
Sample: households who purchased a TV in the last 2 years
At a middle school, the 7th graders will conduct a survey for where to go on a field trip. Which method will result in the least biased decision?
A) to randomly ask 8th grade students who went on a field trip last year
B) to randomly choose some 7th grade students to select a location
C) to ask all 7th grade teachers and administrators for a location
D) to ask the student council to choose a location
Randomly choose some 7th grade students to select a location
A survey of cat owners report that cats on average eats 4 pounds of food in 5 days. How many pounds is reasonable to suggest that they eat in 60 days?
48 lbs
The following data represent the number of pop-up advertisements received by 10 families during the past month. Calculate the mean of advertisements received by each family during the month.
43 37 35 30 41 23 33 31 16 21
31
A factory overseer selects 40 wheels at random from those produced that week at the factory, then she tests their durability. What is the sample and population?
Population: All wheels produced at the factory that week
Sample: The 40 randomly selected wheels
Which scenario would produce the least biased results?
A) Asking athletes at a gym what their favorite television show is
B) Asking fans at a baseball game who their favorite baseball team is
C) Asking shoppers at a store where their favorite place to shop is
D) Asking students in a college library what their favorite college sports team is
Asking athletes at a gym what their favorite television show is
A survey shows that 8 out of every 60 lightbulbs produced at a factory are defective. How many could the company infer will be defective out of a batch of 150?
20 lightblubs
What is the median score achieved by a student who recorded the following scores on 10 math quizzes?
68, 55, 70, 62, 71, 58, 81, 82, 63, 79
69
A pediatrician randomly selected 10 parents of his patients. Then he surveyed the parents about their opinions of different kinds of diapers. What is the population and sample surveyed?
Population: Parents of the pediatricians patients
Sample: 10 randomly selected parents
A new cable TV station wants to study the viewing habits of households in New York. The station surveys every household that purchased a new TV within the last 2 years in New York. Is this random sampling? (hint: think about the population they're sampling)
No since they would only get answers about the habits of households with TV's
After a testing a sample of boxes produced in a week, 7% of the boxes tested were defective. How many can the company infer will be defective out of all 15,000 produced in a week?
1050 boxes
Which of the measures of central tendency can have more than one value for a set of data?
Mode