You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. how many randomly selected air passengers must you survey? assume that you want to be 90% confident that the sample percentage is within 5.5 percentage points of the true population percentage. assume that nothing is known about the percentage of passengers who prefer aisle seats.

Solution: We are given:

Margin of error

Confidence level

or

Since we are not given the proportion of passengers who prefer aisle seats, therefore we assume it to be

Now, the formula for finding the sample size is:

Where:

is the critical value at 0.1 significance level

                      rounded to nearest integer

step-by-step explanation:

quartic functions has x = –1 and x = –2 as its only two real zeroes:

f(x) = a(x+2)(x+1)   a: real number

4/6 = 2/3

so it should take 3/3 hours per man. so 9 hours is the answer 3*3 =9

step-by-step explanation: