Chapter 6 Review

What distribution do you use if the sample size is under 30?

• z-distribution

• t-distribution

• population proportion

What distribution do you use if the sample size is equal to or greater than 30?

• z-distribution

• t-distribution

• population proportion

d.f. = n - 1

• True
• False

What button(s) do you use in the calculator to find an interval?

• 2nd>Stat

• Stat>Calc

• Stat>Tests

• 2nd>Vars

What button(s) do you use in the calculator to find a critical value?

• 2nd>Stat

• Stat>Calc

• Stat>Tests

• 2nd>Vars

Find the critical value z necessary to form a confidence interval for c = 0.98

• 1.96

• 1.64

• 2.33

• 2.58

Which formula should you use the answer the following question?

Find the margin of error for the given values c = 0.98, σ = 4.6, and n = 100

Which formula should you use the answer the following question?

Find the margin of error for the given values c = 0.95, s = 9, and n = 18

Which formula should you use the answer the following question?

Find the margin of error for the population proportion if x = 4000, n = 2381, c = 0.85.

Which formula do you use to determine minimum sample size if no preliminary information has been given for a proportion?