A random sample of Hummers for sale in Los Angeles and New York were taken from listings at cars. com. We want to know if there is a difference in mean listing prices between Hummers for sale in Los Angeles (group 1) and Hummers for sale in New York (group 2). Create a 95% confidence interval for the true difference of mean listing prices between the two cities. Open the data file Used Hummers LA and NY. Use this information to answer question 18 and 19. 18. Of the four types of confidence intervals listed below, which one is appropriate for this situation?
Confidence interval for Image for A random sample of Hummers for sale in Los Angeles and New York were taken from listings at cars. com. We want when sigma is known.
Confidence interval for Image for A random sample of Hummers for sale in Los Angeles and New York were taken from listings at cars. com. We want when sigma is unknown.
Confidence interval for the difference of means, using independent samples.
Confidence interval for the mean of differences, using dependent samples.
19. Which of the following is the 95% confidence interval for the true difference of mean listing prices between Hummers from LA and NY?
(-210, 6221)
(-770, 5764)
(-423, 5417)
(-402, 5396)

the answer   is 200

step-by-step explanation:

this is a problem about poisson probabilities.   i don't know if you've

already studied poisson distributions, or if you have a place to look

to read more about the subject.  

here's how you can see a poisson distribution coming.   when there are

a lot of events that may happen at any time (or any place), and when

you're counting how many of them happen at a particular time (or a

particular place), and each event is independent of the others, then

the result is a poisson distribution.   this is roughly true for the

chocolate chips; one chip being in a cookie has only a small effect on

the probability that another chip will be in the cookie.

once you know you have a poisson distribution, you know a lot.   there

is only one parameter to a poisson distribution, so if you know the

mean, you know everything.   the form of the distribution is

  probability of n chips = {[e^(-x)]*(x^n)} / (n! )

step-by-step explanation:

0.6, 3/5, and 6% are the 3 same portion.

but, when they're all changed to a decimal they would equal to 0.6.

hope this , good luck!

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is