help please!

- anonymous

help please!

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- anonymous

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

- anonymous

@Vocaloid

- Vocaloid

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

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## More answers

- anonymous

b

- Vocaloid

correct ~

- anonymous

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

- anonymous

b?

- Vocaloid

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

- anonymous

A

- Vocaloid

good

- Vocaloid

how many of these are left?

- anonymous

a couple :)

- anonymous

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

- Vocaloid

same as the other one...

- Vocaloid

about the grammar and math book

- anonymous

A

- anonymous

@Vocaloid

- Vocaloid

almost but not quite......

- anonymous

d

- Vocaloid

right......

- anonymous

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.

- anonymous

@Vocaloid

- Vocaloid

hint: is there an outlier in the data?

- anonymous

C?

- Vocaloid

yup

- anonymous

@Vocaloid

##### 1 Attachment

- Vocaloid

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)

- anonymous

ok soo?

- Vocaloid

read....

- Vocaloid

the......

- Vocaloid

answer....

- Vocaloid

choices........

- anonymous

A?

- Vocaloid

read what I wrote carefully...

- anonymous

oh b

- Vocaloid

right

- anonymous

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.

- Vocaloid

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

- anonymous

b?

- anonymous

i thought it was A

- Vocaloid

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

- anonymous

so the answer is b?

- Vocaloid

right...

- anonymous

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

- Vocaloid

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

- anonymous

oh okay :)

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