We need to estimate the percentage of businesses that plan to hire additional employees in the next 60 days.  a) How many randomly selected employers must we contact in order to create an estimate in which we are 95% confident with a margin of error of 6%? b) Suppose we want to halve the margin of error. What sample size will suffice?

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. Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. (Round up to the nearest integer.) b. Assume that a prior survey suggests that about 38% of air passengers prefer an aisle seat. (Round up to the nearest integer.)

A programmer plans to develop a new software system. In planning for the operating system that he will​ use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99​% confident that his estimate is in error by no more than three percentage points? Complete parts​ (a) through​ (c) below.       Question content area bottom Part 1 ​a) Assume that nothing is known about the percentage of computers with new operating systems.   n=enter your response here ​(Round up to the nearest​ integer.) Part 2 ​b) Assume that a recent survey suggests that about 90​% of computers use a new operating system.   n=enter your response here ​(Round up to the nearest​ integer.) Part 3

A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99% confident that his estimate is in error by no more than four percentage points? Complete parts (a) through (c) below. a) Assume that nothing is known about the percentage of computers with new operating systems. n= (Round up to the nearest integer.)

A programmer plans to develop a new software system. In planning for the operating system that he will​ use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99​% confident that his estimate is in error by no more than two percentage points question mark Complete parts​ (a)  a) Assume that nothing is known about the percentage of computers with new operating systems.