Question

help please!

Answer 1

Angela wants to know how many families in her neighborhood plan to attend the parade. She puts all 120 of the neighborhood addresses in a hat and draws a random sample of 30 addresses. She then asks those families if they plan to attend the parade. She finds that 40% of the families plan to attend the parade. She claims that 40% of the neighborhood families would be expected to attend the parade. Is this a valid inference?

Yes, this is a valid inference because the 30 families speak for the whole neighborhood
Yes, this is a valid inference because she took a random sample of the neighborhood
No, this is not a valid inference because she did not take a random sample of the neighborhood
No, this is not a valid inference because she asked only 30 families

Answer 2

@Vocaloid

Answer 3

well, this IS a random sample so our answer is ... ?

Answer 4

b

Answer 5

correct ~

Answer 6

Carla wants to know how many students in her school enjoy watching reality TV shows. She asks all 22 students in her science class and finds that 40% of her classmates enjoy watching reality TV shows. She claims that 40% of the school's student population would be expected to enjoy watching reality TV shows. Is Carla making a valid inference about her population?

No, it is not a valid inference because her classmates do not make up a random sample of the students in the school
No, it is not a valid inference because she asked all 22 students in her science class instead of taking a sample of the students in her school
Yes, it is a valid inference because she asked all 22 students in her science class
Yes, it is a valid inference because her classmates make up a random sample of the students in the school

Answer 7

b?

Answer 8

nope, remember... this is not a random sample

Answer 9

A

Answer 10

good

Answer 11

how many of these are left?

Answer 12

a couple :)

Answer 13

Magdeline wants to know if the number of words on a page in her computer science book is generally more than the number of words on a page in her math book. She takes a random sample of 25 pages in each book and then calculates the mean, median, and mean absolute deviation for the 25 samples of each book.


Book Mean Median Mean Absolute Deviation
Computer science 48.7 40 9.4
Math 34.2 45 1.9


She claims that because the mean number of words on each page in the computer science book is greater than the mean number of words on each page in the math book, the computer science book has more words per page. Based on the data, is this a valid inference?
Yes, because there is a lot of variability in the computer science book data
Yes, because the mean is larger in the computer science book
No, because the mean is larger in the computer science book
No, because there is a lot of variability in the computer science book data

Answer 14

same as the other one...

Answer 15

about the grammar and math book

Answer 16

A

Answer 17

@Vocaloid

Answer 18

almost but not quite......

Answer 19

d

Answer 20

right......

Answer 21

Jasper is using the following data samples to make a claim about the house values in his neighborhood:


House Value
A $150,000
B $175,000
C $200,000
D $167,000
E $2,500,000


Based on the data, should Jasper use the mean or the median to make an inference about the house values in his neighborhood?
He should use the mean because it is in the center of the data.
He should use the median because it is in the center of the data.
He should use the median because there is an outlier that affects the mean.
He should use the mean because there are no outliers that affect the mean.

Answer 22

@Vocaloid

Answer 23

hint: is there an outlier in the data?

Answer 24

C?

Answer 25

yup

Answer 26

@Vocaloid

Answer 27

well judgint by the graph I would say that graph B has the greater numbers, on average, and the numbers are a lot more spread out (less consistent)

Answer 28

ok soo?

Answer 29

read....

Answer 30

the......

Answer 31

answer....

Answer 32

choices........

Answer 33

A?

Answer 34

read what I wrote carefully...

Answer 35

oh b

Answer 36

right

Answer 37

Evelyn goes to a middle school that includes grades 6, 7, and 8. She wants to estimate the percentage of students in the school who ride the bus to school. She selects a random sample of 200 students to survey who are attending an after-school activity. She determines that 38% of the students at the activity ride the bus to school.

Which statement about Evelyn's sample is true?

A. The sample is the percentage of students who ride the bus.
B. The sample might not be representative of the population because it only includes students who are attending an after-school activity.
C. The sample shows that exactly 38% of the students in the school ride the bus.

Answer 38

hint: she's only looking at the students for the after-school activity...

Answer 39

b?

Answer 40

i thought it was A

Answer 41

B, remember that she's only looking at some students, not all of them

Answer 42

so the answer is b?

Answer 43

right...

Answer 44

but isnt it A because its talking about the percentage of students who ride the bus?

Answer 45

38% of the students at the activity rode the bus

this tells us nothing about the percentage of ALL students who rode the bus, which is what she is trying to find

Answer 46

oh okay :)