WorksheetsEstimation and Confidence Intervals Quiz
Total questions: 11
Worksheet time: 17mins
What is an estimator?
A population parameter
A statistic used to estimate a parameter
A random variable
A fixed value
Which estimator is considered unbiased?
One with minimal variance
One equal to the parameter it estimates
One with maximum variance
One that overestimates the parameter
What does a point estimator do?
Estimates the range of a parameter
Provides a single value estimate
Determines the confidence level
Calculates the sample size
What does a confidence interval estimate?
The exact population parameter
The range of possible parameter values
The sample size needed
The expected value of the parameter
What is the confidence level in a confidence interval?
The likelihood that the parameter lies within the interval
The probability that the sample mean equals the population mean
The probability of the interval being unbiased
The degree of variability in the sample
Which condition justifies using the normal approximation in proportion estimation?
When both n and p are small
When n and p are greater than five
When the sample size is very large
When the population variance is known
What is the margin of error in an estimate?
The total sample size
The maximum likely difference between the estimate and the parameter
The population mean
The standard deviation of the estimator
What does a sample mean estimate in a population?
Population variance
Population mean
Population proportion
Confidence level
What happens when the confidence level of an interval increases?
The interval becomes narrower
The interval becomes wider
The point estimate changes
The sample size decreases
What is required to reduce the length of a confidence interval?
Increase the confidence level
Increase the sample size
Decrease the sample variance
Increase the population size
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