Unit 1 II Maths stat

A population refers to:

• A sample of individuals

• A subset of data

• The entire set of individuals or items under study

• None of the above

A statistic is:

• A characteristic of the population

• A numerical summary of a sample

• Always equal to the parameter

• Not related to inference

A parameter is:

• Calculated from the sample

• A fixed but unknown value describing the population

• Always known

• Not used in estimation

Which of the following is a parameter?

• Sample mean

• Sample variance

• Sample median

• Population mean

The purpose of using a sample is to:

• Make inferences about the population

• Replace the population

• Increase cost

• Avoid statistics

A point estimator provides:

• No useful information

• An interval

• An estimate for the entire population

• A single value estimate of a parameter

Which of the following is a point estimator?

• Confidence interval

• Sample mean

• Sample size

• Population

A good point estimator should be:

• Biased

• Inconsistent

• Unbiased

• Large

If x̄ is the point estimator for μ, then s² is the point estimator for:

• σ

• σ²

• μ

• x̄

The sample proportion p̂ is used to estimate:

• Mean

• Median

• Variance

• Population proportion