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

im with everythinglos so yeahhhhh

step-by-step explanation:

hello 0xxbadwolfxx0,

2.6 x 10^9 is 2,600,000,000.

1.3 x 10^2 is 130

multiplying 130 and 2,600,000,000 would simply give you 200,000,000,000.

therefore, the answer would be d. 2.0 × 10^11.

i hope i ! warm regards, mae.