A researcher is considering three methods of evaluating two different brands of firstaid healing ointment for minor cuts. Classify each method as a survey, an experiment,or an observational study. Then explain which method would be the most reliable.Method A: Randomly divide a group of 100 people with minor cuts into two groups.Have each group use a different ointment and record how long it takes their cuts toheal.Method B: Choose 100 people at random. Ask which ointments they have used inthe past and how quickly their cuts have healed with each ointment.Method C: Monitor 100 people who are currently treating minor cuts with anointment of their choosing and record how long it takes for them to heal.Tell whether each method of gathering data is a survey, an observational study, or an Method A: Randomly divide a group of 100 people with minor cuts into two groups.Have each group use a different ointment and record how long it takes their cuts toheal.Method B: Choose 100 people at random. Ask which ointments they have used inthe past and how quickly their cuts have healed with each ointment.Method C: Monitor 100 people who are currently treating minor cuts with anointment of their choosing and record how long it takes for them to heal.Tell whether each method of gathering data is a survey, an observational study, or anexperiment. Which option would give the most reliable results?

The appropriate nature (i.e., survey, observation, or experiment) of the considered methods, which…

Answered: Method A: Randomly divide a group of…

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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A magazine provided results from a poll of 1000 adults who were asked to identify their favorite pie. Among the 1000 respondents, 12% chose chocolate pie, and the margin of error was given as ±5 percentage points. Describe what is meant by the statement that "the margin of error was given as ±5 percentage points."
Three products were used in a hot summer to keep the pool chlorine level high. Each product was used in 6 pools, and there was a total of 18 pools in the experiment. The same amount of chlorine was added to each pool (A, B, or C) and the conditions such as pool size, temperature, sun exposure etc. were similar. The chlorine levels (%) were measured and recorded after 24 hours of using the products. The percentages in the table below are the percentage of the chlorine added to the pool remaining after this 24 hours. The data is as follows: A 96 56 52 66 70 60 B 44 36 34 50 40 48 с 723227 34 40 20 24 a) Find the overall mean of the chlorine level across all the pools measured, and then find the mean of the chlorine level for each product.
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A certain affects virus 0.4% of the population (in a population of 100,000 people, 400 will be infected with the virus). A test used to detect the virus in a person is positive 87% of the time if the person has the virus (true positive) and it is positive 14% of the time if the person does not have the virus (false positive). Fill in the remainder of the following table and use it to answer the questions below. Infected Not Infected Total Positive Test Negative Test Total 400 99,600 100,000
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