A medical researcher studies a strain of E. coli to see how resistant it is to a
ID: 3133908 • Letter: A
Question
A medical researcher studies a strain of E. coli to see how resistant it is to antibiotics. She prepares 50 cultures of the strain and subjects them all to a common antibiotic. After 48 hours, she classifies each culture as either viable or nonviable. She wants to estimate the true percentage of viable cultures. A confidence interval for which of the following would be best for her to use?
One mean, known
One mean, unknown
Paired data
Two means, using independent samples
One proportion
Two proportions
A medical researcher studies a strain of E. coli to see how resistant it is to antibiotics. She prepares 50 cultures of the strain and subjects them all to a common antibiotic. After 48 hours, she classifies each culture as either viable or nonviable. She wants to estimate the true percentage of viable cultures. A confidence interval for which of the following would be best for her to use?
One mean, known
One mean, unknown
Paired data
Two means, using independent samples
One proportion
Two proportions
Explanation / Answer
As we only have one sample, and we are talking about percentages of viable cultures, then it is
OPTION E: ONE PROPORTION [ANSWER]
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