How long does it take to fly from Atlanta to New York’s LaGuardia airport? There are many components of the time elapsed, but one of the more stable measurements is the actual in-air time. For a sample of eighty-three flights between these destinations on Fridays in October, the time in minutes (y) gave the following results:

61 61
Σ yi= 6450 and Σ yi^2=684,900
i=1 i=1

Required:
Find a 99% confidence interval for the average flight time.

The 99% confidence interval for the average flight time is (103.38, 108.10).

Step-by-step explanation:

The (1 - α)% confidence interval for population mean when the population standard deviation is not known is:

The information provided is:

Compute the sample mean as follows:

Compute the sample standard deviation as follows:

The critical value of t for 99% confidence level and (n - 1) = 60 degrees of freedom is:

*Use a t-table.

Compute the 99% confidence interval for the average flight time as follows:

Thus, the 99% confidence interval for the average flight time is (103.38, 108.10).

step-by-step explanation:

step-by-step explanation:

i think something is missing in your question because y-1=(x-12) would not pass through the point (-4,-3). because if you replace x by -4 your are supposed to find y=-3 which is not the case her. if you replace x by -4 you find =-15.

i assume the right equation is y-1=1/4*(x-12) because this one is passing through both your points (if you are interested to know how i found that out i can tell you).

in this equation if i replace x by -4 i find y=-3 and if i replace x by 12, i find y=1 so the line representing this equation is passing through those 2 points.

then the standard form of the equation is finding an expression of y in function of x

y-1=1/4*(x-12)

y=x/4-3+1

y=x/4-2

hope that .

do you confirm there was a mistake in the question?