Question

anyone know statistics??????/

Answer 1

i sure do

Answer 2

k i need help with my homework

Answer 3

heres the first question

Answer 4

A political strategy team collected some preliminary data from voters in a certain district. Using the data, they created a confidence interval for the proportion of voters in the district for their candidate, (39.30% to 53.15%). If they collected data from 344 voters altogether, compute the level of confidence they used when creating their interval. Show work.

Answer 5

can anyone help me with my statistic homework????????/

Answer 6

The key formula here is \[\hat p \pm {z_{1 - \alpha /2}}\sqrt {\frac{{\hat p(1 - \hat p)}}{n}} \]

Answer 7

would you be able to help me start it off?

Answer 8

i'm looking through my stats textbook so I do it right :p

Answer 9

ok

Answer 10

p hat is the mean of 39.3 and 53.15
p hat = (39.3+53.15)/2 = 46.225
The difference of 39.3 and 53.15 = 13.85 =
\[{2 *z_{1 - \alpha /2}}\sqrt {\frac{{\hat p(1 - \hat p)}}{n}} \]

Answer 11

\[\sqrt {\frac{{\hat p(1 - \hat p)}}{n}} \] = Sqrt[.46225*(1-.46225)/344] = 0.0268812

Answer 12

.1385 / (2 * .0268812) = 2.57615 = \[{z_{1 - \alpha /2}}\]

Answer 13

2.57615 is the answer?

Answer 14

no

Answer 15

im confused

Answer 16

need to use that to solve for alpha

Answer 17

gotta find a calculator or table for that

Answer 18

i have a caluculator ti84

Answer 19

so the confidence is 98%?

Answer 20

I get 99.5%

Answer 21

i mean 99%

Answer 22

yeah sorry i got it...wow thanks so much

Answer 23

how do i get it on the calculator?

Answer 24

I think 99% is correct

Answer 25

i have another question...its about of this question...Can the political strategy team from part c conclude that their candidate will win or lose or what? Explain. Presume in this district, a simple majority will take the election.

Answer 26

i mean apart of the recent question

Answer 27

since the mean is below 50%, he'll probably lose

Answer 28

thanks for the help i was really stuck....if its not a bother would u be able to help me with another one...

Answer 29

The website www.project.org claims that in 2007, the average miles per gallon for cars in America was about 23. How do Cecil College drivers do compared to that benchmark? Do we differ? Your job is to investigate this claim for our drivers.
a. Using the data collected from our StatCrunch survey, first print an appropriate graph, calculate the appropriate summary statistics and write a brief description of the distribution of miles per gallon for the cars in our sample.
b. Run the appropriate hypothesis test. Points awarded for hypotheses, conditions, test statistic, P-value, decision, and conclusion.
c. Give a 99% confidence interval to support your conclusion in part b. Interpret your interval.

Answer 30

where is the data?

Answer 31

i did a summary statistics and did a column statistics and my results were n=59, mean= 308.85593, variance 4712126, std. dev.= 2170.7432, std. err.= 282.6067

Answer 32

is that right? there was a column for mpg and that's what i put in for the summary

Answer 33

or if you want i can attach the file

Answer 34

i don't think the link is working

Answer 35

umm hold on...

Answer 36

Year Make Vehicle MPG
2009 Scion TC Car 25
2005 Honda Accord Car 24
2001 Toyota Celica Car 23
2001 Chevrolet Cavalier Car 27
2008 Mazda 3 Car 27
2007 Chevy Imapala Car 26
2007 Chevy Cobalt Car 25
2006 Pontiac Grand Am Car 23
2002 Suzuki Esteem Car 26
2008 kia,rio Car 29
2001 VW Passat Car 27
2003 Toyota Matrix Car 27
1995 Toyota Corolla Car 25
2006 Honda Civic Car 35
1998 Honda Accord Car 24
2001 Toyota camery Car 26
2011 Toyota Camry Car 30
2011 Mazda 2 Car 29.5
1996 Ford Crown Victoria Car 17
1997 Volkswagon Passat Car 42
1999 VW Jetta Car 37
2004 Toyota Carolla Car 33
2010 Altima Coupe Car 26
1999 GM Saturn Car 29
2011 Hyundai Genesis Coup Car 26
2011 Nissan Altima Car 27
1999 Dodge Stratus Car 22
2008 Pontiac G6 Car 21.5
2003 Chevrolet Impala Car 26.5
1997 Subaru Impreza Car 23
2008 Ford Focus Car 38
2004 Chevrolet cavalier Car 25
2001 Oldsmobile Alero Car 27
2003 Honda Civic Car 30
2001 Olds Mobile Alero Car 26
2011 Chevy Aveo Car 31
2010 Mazda 3 Car 33
2008 Dodge Caliber Car 24
2010 Ford Focus Car 33
2000 Oldsmobile Intrigue Car 28
2003 Ford Mustang Car 18
2003 Ford Taurus Car 20
1996 Pontiac Grand Prix SE Car 21
2001 nissan sentra Car 24
2004 Dodge Stratus Car 18
2010 Dodge Avenger Car 25.5
2000 Mazda Milennia Car 20
1999 Chrysler 300m Car 22.5
2000 Toyota Celica Car 27
2006 Ford Mustang Car 19
2003 Chevy Cavalier Car 30
2005 Honda Accord Car 30
2002 Honda Civic Car 30
2001 VW Car 27
2007 Honda civic Car 24
2002 Mitsiubishi, lancer Car 16
2004 Honda Accord Car 16700
2001 Chrysler Pt Cruiser Car 24
2007 Mazda r3 Car 23
FOR 16700 my professor said used my best judgement but i am confused why this number was so big...which 16700 in a car is impossible

Answer 37

it's got to be a type, or he wants you to throw it out

Answer 38

typo

Answer 39

i dont know maybe he said use my best judgement and i dont want to make up a number.. i dont know he doesnt explain much at all to his students

Answer 40

dcrose are you having trouble with the numbers