Sampling and Survey design

What is a characteristic of random error?

• A translation of the data from the true value

• Spread about the central value

• No choice but to give up and start again

• Accuracy

Which error requires starting over?

• Systematic error

• Gross error

• Random error

• Repeatability error

Which error is described as a spread about the central value?

• Gross error

• Systematic error

• Random error

• Repeatability error

Which error type is independent of systematic error?

• Gross error

• Random error

• Repeatability error

• None of the above

Which of the following is a measure of central value?

• Range

• Median

• Variance

• Standard deviation

What does the mean assume about the nature of distribution?

• It is always geometric

• It is always arithmetic

• It is normal or log normal

• It is always uniform

For a normal distribution, which of the following is true about the mean, median, and mode?

• They are all different

• Mean is greater than median

• They are all the same

• Mode is less than mean

You have measured a value as 10.07 and calculated the error to be ± 0.1. You should quote the value as:

• 10.1
• 10.07

• 10

• 10.070

You have calculated a value as 10.172 and found the error to be ± 0.00791. You should quote the error value as:

• ± 0.00798

• ± 0.007910

• ± 0.008

• ± 0.0079

You are reporting a value as: at the 95% confidence level the mean was x = 10.01 ± 0.01. What is missing?

• The sample size

• The unit

• The type of mean that was taken

• All of the above