Question

Suppose a study estimated that 58% of the residents of a town (with an error range of ±8 percentage points at 95% confidence) favor expanding the park and recreation department. Which of the following percentages of the town's residents may favor expanding the park and recreation department?

A:92%
B:82%
C:52%
D:72%

Answer 1

@kirbykirby can you help me on this one too

Answer 2

If the confidence interval is \(58 \pm 8\), then your lower bound is \(58-8 = 50\) and the upper bound is \(58+8=66\). So, you should expect to find a value between 50 and 66 to be a value you need.

Answer 3

so it would be 52% which is C?

Answer 4

yes

Answer 5

thank you!

Answer 6

:)

Answer 7

is it okay if i ask you if i have any more questions? if not i completely understand i dont want to keep bothering you

Answer 8

you could, but I should be going in about ~20 mins or so

Answer 9

okay well i guess i will be using those twenty minutes wisely
i have to take a test tomorrow so might as well get all the help i can, can you help me on this one

Answer 10

The owners of four companies competing for a contract are shown in the table below. If a report is released that advocates company B, which of the people having funded the report should result in the most skepticism?

Company
Owner of Company
Company A Jake Adams
Company B Debby Smith
Company C Henry Rose
Company D Rhonda Baker

A. Jake Adams
B. Debby Smith
C. Rhonda Baker
D. Henry Rose

Answer 11

Do you have at least an idea?

Answer 12

not really, i wouldnt know where to start. it wouldnt be debby smith for sure because she is the owner but idk theres 3 other options that could work

Answer 13

Well it should be Debby because she is biasing the report by self-reporting positive views, in which I would assume the report would have to be from some neutral source. (because she funded the report)

Answer 14

And there is no information anyway from the other companies to make any decision about them

Answer 15

OH makes sense, haha blonde moment

Answer 16

no worries :)

Answer 17

i have like 3 more questions then im done

Answer 18

sorry its alot

Answer 19

Suppose that a company claims that its coffee cans contain 9.4 ounces of coffee, on average. You take many large samples, and find, each time, that the mean weight of the sample is within the 95% confidence interval. Which of the following would be a reasonable conclusion?
A. The company's coffee cans contain more than 9.4 ounces of coffee, on average.
B. The company's coffee cans contain 9.4 ounces of coffee, on average.
C. The company's coffee cans do not contain 9.4 ounces of coffee, on average.
D. The company's coffee cans contain less than 9.4 ounces of coffee, on

Answer 20

average

Answer 21

I would go with B. The confidence interval is symmetric, so even if the values are not 9.4 exaclty, on average, they should measure out to be about 9.4 with a large sample

Answer 22

That was right! thanks 2 more... one second

Answer 23

:)

Answer 24

The Water Department checks the city water supply on a regular basis for contaminants such as lead. The Water Department takes 200 samples and estimates that the concentration of lead in your drinking water is 3 ppb (parts per billion), with a standard deviation of 0.3 ppb.

Assuming the samples were random and unbiased, how much confidence can you have in this data?
A. 95% confident the average concentration of PCBs in the water supply is between 2.4 ppb and 3.6 ppb.
B. 97% confident the average concentration of PCBs in the water supply is between 2.6 ppb and 3.8 ppb.
C. 99.7% confident the average concentration of PCBs in the water supply is between 2.7 ppb and 3.3 ppb.

Answer 25

D: 68% confident the average concentration of PCBs in the water supply is between 2.9 ppb and 3.1 ppb.

Answer 26

The confidence interval will be \(\Large \left( \bar{x}- z\frac{\sigma}{\sqrt{n}}, ~ \bar{x}+ z\frac{\sigma}{\sqrt{n}}\right) \)

Answer 27

im going to solve it, but would you mind solving it too so i can see if i got the right answer?

Answer 28

ok

Answer 29

thanks

Answer 30

i think its A

Answer 31

I didn't get A at all :o

Answer 32

.... then i will need to do this again

Answer 33

is it C? because thats the closest thing that is to my answer

Answer 34

I feel D gives me the closest answer

Answer 35

i believe you more than me.

Answer 36

i dont understand how you got it though
im pretty sure i plugged everything in right?

Answer 37

Dang it! i was right

Answer 38

it was A

Answer 39

okay i have to get this last one right or i cant take the test tomorrow...

Answer 40

\[ 3 \pm 1.96 \frac{0.3}{\sqrt{200}}\] is what you did?

Answer 41

Which choice below is a boxplot for the following distribution?

58,50,48,46,44,42,40,38,36,34,32,30,28,26,24,22,14

A. Boxplot A
B. Boxplot B
C. Boxplot C
D. Boxplot D
E. Boxplot E

Answer 42

http://assets.openstudy.com/updates/attachments/53d14974e4b0bff525b46bbc-countryrockbabe-1406224785290-c44de8dd159642438e142c100fd603d1.gif

Answer 43

Those are the plots

Answer 44

and yeah thats what i did

Answer 45

idk why its saying that im still typing but im not lol

Answer 46

you still here?

Answer 47

dang