Estimating Parameters and Determining Sample Sizes 7-2

What is a Point Estimate in statistics?

• A single value estimate of a population parameter

• A range of values estimate of a population parameter

• A hypothesis test result

• A type of data distribution

A Confidence Interval is used in statistics to:

• estimate the range within which a population parameter lies

• determine the exact value of a population parameter

• test a hypothesis about a population parameter

• calculate the mean of a sample

Sample Size is important in estimating a population mean because:

• it determines the accuracy of the estimate.

• it has no effect on the estimate.

• it complicates the calculation process.

• it is only needed for large populations.

What does the symbol 'μ' represent in the context of confidence intervals?

• A) Sample mean

• B) Population mean

• C) Sample standard deviation

• D) Margin of error

What does the symbol 'x̄' represent in the context of confidence intervals?

• A) Sample mean

• B) Population mean

• C) Sample standard deviation

• D) Margin of error

What does the symbol 's' represent in the context of confidence intervals?

• A) Sample mean

• B) Population mean

• C) Sample standard deviation

• D) Margin of error

What does the symbol 'E' represent in the context of confidence intervals?

• A) Sample mean

• B) Population mean

• C) Sample standard deviation

• D) Margin of error

The format of a confidence interval when sigma is not known is:

• (a) Z-interval

• (b) T-interval

• (c) Chi-square interval

• (d) F-interval

For a 0.95 (or 95%) confidence level, α = ____.

• 0.05

• 0.10

• 0.01

• 0.15

How is the degrees of freedom calculated when finding the critical value?

• Degrees of Freedom: df = n - 1 is the number of degrees of freedom used when finding the critical value.

• Degrees of Freedom: df = n + 1 is the number of degrees of freedom used when finding the critical value.

• Degrees of Freedom: df = n is the number of degrees of freedom used when finding the critical value.

• Degrees of Freedom: df = n - 2 is the number of degrees of freedom used when finding the critical value.