In a random sample of 30 people who rode a roller coaster one day, the mean wait time is 46.7 minutes with a standard deviation of 9.2 minutes. in a random sample of 50 people who rode a ferris wheel the same day, the mean wait time is 13.3 minutes with a standard deviation of 1.9 minutes. construct a 99% confidence interval for the difference between the mean wait times of everyone who rode both rides.
a. (31.7, 35.1)
b. (30.5, 36.3)
c. (29, 37.8)
d. (28.7, 38.1)

C.

Step-by-step explanation:

The confidence interval for difference of two population mean is given by :-

Given : Level of significance :

Then , significance level :

Critical value :

Hence,  a 99% confidence interval for the difference between the mean wait times of everyone who rode both rides

answer:   n ≤ -3 or n < -5

step-by-step explanation:

-5 + 2n ≥ -11

+5             +5

2n ≥ -6

2/2 ≤ -6/2

n ≤ -3

-6 - 10n > 44

+6           +6

-10n > 50

-10/-10 50/-10

n < -5

two data sets with the same median will not have the same varaibility

step-by-step explanation: