After measuring the cortisol level in 30 students (see problem 1a) it is average cortisol levels measured at 324 nmol /I with a standard deviation of 48 nmol / I. We assume that the cortisol concentration follows a normal distribution. Rain out the margin of error in the measured average value for 95% confidence level. The standard normally distributed z-value is equal to 1.96 for a 95% confidence level.

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Please solve only 1b in 30 minute please
Exercise 1b
After measuring the cortisol level in 30 students (see problem 1a) it is
average cortisol levels measured at 324 nmol /I with a standard deviation of
48 nmol / I. We assume that the cortisol concentration follows a normal distribution. Rain
out the margin of error in the measured average value for 95% confidence level.
The standard normally distributed z-value is equal to 1.96 for a 95% confidence level.
Transcribed Image Text:Exercise 1b After measuring the cortisol level in 30 students (see problem 1a) it is average cortisol levels measured at 324 nmol /I with a standard deviation of 48 nmol / I. We assume that the cortisol concentration follows a normal distribution. Rain out the margin of error in the measured average value for 95% confidence level. The standard normally distributed z-value is equal to 1.96 for a 95% confidence level.
1а
You will conduct a study at OsloMet where the stress level among
the students at the Study Program for Biotechnology and Chemistry will be mapped.
The stress level should be determined by measuring the morning concentration
the stress hormone cortisol in saliva samples collected from a sample of students.
Which sampling strategy do you want to choose to get as representative as possible
reply? The answer must be substantiated.
Transcribed Image Text:1а You will conduct a study at OsloMet where the stress level among the students at the Study Program for Biotechnology and Chemistry will be mapped. The stress level should be determined by measuring the morning concentration the stress hormone cortisol in saliva samples collected from a sample of students. Which sampling strategy do you want to choose to get as representative as possible reply? The answer must be substantiated.
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