You want to estimate the percentage of adults who believe that passwords should be replaced with biometric security (such as fingerprints). How many randomly selected adults must you survey? Assume that you want to be 90% confident that the sample percentage is within 4.1 percentage points of the true population percentage. Complete parts (a) through (C) below. a. Assume that nothing is known about the percentage of adults who believe that passwords should be replaced with biometric security. The sample size needed is (Round up to the nearest whole number as needed.) b. Assume that a prior survey suggests that about 46% of adults believe that biometric security should replace passwords. The sample size needed is (Round up to the nearest whole number as needed.) c. Does the additional survey information from part (b) have much of an effect on the sample size that is required? The additional survey information from part (b) causes the required sample size to change by v 10%. Based on this, the additional survey information causes V in the sample size that is required.

You want to estimate the percentage of adults who believe that passwords should be replaced with biometric security (such as fingerprints). How many randomly selected adults must you survey? Assume that you want to be 90% confident that the sample percentage is within 4.1 percentage points of the true population percentage. Complete parts (a) through (C) below. a. Assume that nothing is known about the percentage of adults who believe that passwords should be replaced with biometric security. The sample size needed is (Round up to the nearest whole number as needed.) b. Assume that a prior survey suggests that about 46% of adults believe that biometric security should replace passwords. The sample size needed is (Round up to the nearest whole number as needed.) c. Does the additional survey information from part (b) have much of an effect on the sample size that is required? The additional survey information from part (b) causes the required sample size to change by v 10%. Based on this, the additional survey information causes V in the sample size that is required.

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Concept explainers

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.

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Question

You want to estimate the percentage of adults who believe that passwords should be replaced with biometric security (such as fingerprints). How many randomly selected adults must you survey? Assume that you want to be 90% confident that the sample
percentage is within 4.1 percentage points of the true population percentage. Complete parts (a) through (c) below.
a. Assume that nothing is known about the percentage of adults who believe that passwords should be replaced with biometric security.
The sample size needed is
(Round up to the nearest whole number as needed.)
b. Assume that a prior survey suggests that about 46% of adults believe that biometric security should replace passwords.
The sample size needed is
(Round up to the nearest whole number as needed.)
c. Does the additional survey information from part (b) have much of an effect on the sample size that is required?
The additional survey information from part (b) causes the required sample size to change by
V 10%. Based on this, the additional survey information causes
V in the sample size that is required.

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