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)