A hotel maintenance crew wants to estimate how many of the 12,000 lamps in their 30-story hotel need a new lightbulb. Which of the following is a random sample of lamps to be inspected?(1 point)
Responses
100 lamps on each floor chosen randomly
100 lamps on each floor chosen randomly
400 lamps on the first 10 floors
400 lamps on the first 10 floors
all lamps in booked rooms
all lamps in booked rooms
all lamps from the rooms with king-sized beds
100 lamps on each floor chosen randomly
A local video game store randomly surveyed 80 customers that visited last month about the type of video game they bought. The manager finds that 3 customers bought racing games. If there are 345 customers that visited that month, approximately how many of them bought racing games?(1 point)
_____ customers
Approximately 13.(Return back-calculating 13 is achieved by calculating 3 divided by 80 and multiply the result by 345.)
Which data set has the highest median?
Keep in mind: If there are an odd number of values, the middle number is the median. IF there are an even number of values, the median is in between the two middle numbers.
(1 point)
Responses
{1, 6, 15, 7, 15, 18, 14}
{1, 6, 15, 7, 15, 18, 14}
{8, 20, 13, 14, 12, 9}
{8, 20, 13, 14, 12, 9}
{11, 15, 16, 8, 12, 14}
{11, 15, 16, 8, 12, 14}
{1, 10, 8, 29, 14, 17, 3}
{11, 15, 16, 8, 12, 14}
Luis wants to know what type of music 7th graders at SCCA like to listen to the most. There are 550 students in the 7th grade. He places each student in a random name generator and randomly selects 75 students. In this situation, what is the population and what is the sample?(2 points)
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
Response area is the population and Response area is the sample.
550 7th grade studentsAll of the students enrolled at SCCA75 randomly selected studentsThe 475 students who were not chosen.
Population: 550 7th grade students
Sample: 75 randomly selected students
It is important to determine if generalizations are valid. We can consider the following two things:
Was the sample random? Did all members of the population have an equal chance of being selected?
Is the sample size large enough based on the population size?
(3 points)
Valid Invalid
The principal at a middle school wants to know the average number of clubs students participate in. She uses a random number generator from 0-500 representing all students. She chooses 100 numbers at random and surveys these students. She concludes that students participate on average in 2 clubs each.
Jorge wants to know how many students in his school are going to the basketball game. Jorge asks 5 of his friends, and all of them say they are going. He concludes that all students will attend the basketball game.
Nick wants to determine the most popular sport in his school of 500 students. He puts the names of all the students in the box, draws 100 of them, and surveys them all. He determines that soccer is the most popular sport in the school.
Valid
Invalid
Valid