The average cost per night of a hotel room in new york city is $273 (smartmoney, march 2009). assume this estimate is based on a sample of 45 hotels and that the sample standard deviation is $65.
a. with 95% confidence, what is the margin of error (to 2 decimals)?
b. what is the 95% confidence interval estimate of the population mean?
note: this is what i got but it is wrong. a. 18.99 b. [254.008, 291.992]

step-by-step explanation:

it's is b

the required function is .

step-by-step explanation:

from the given table it is noticed that the graph passing through (-3,7), (0,4), (3,1) and (8,-4).

it is a linear function because the value of y is decrease by one as the value of x increase by 1.

the slope of the function is

the slope of the function is -1 and the y-intercept is 4.

the slope intercept form is

where, m is slope and b is y-intercept.

therefore the required function is . the graph of this function is shown below.