AP Stats

Which has the widest confidence interval for the same data?

• 90% CL

• 95% CL

• 98% CL

• 99% CL

A confidence interval for the proportion of students who scored above 1250 on the SAT is to be constructed. All things being equal, which of the following will result in the smallest margin of error?

• Larger sample size.

• Lower confidence level.

• Both

• Neither

In a middle school with 500 students, it was found the true proportion of brunettes is 17.8%. If you were to construct a confidence interval for the proportion of brunettes with sample size n = 50, which of the following are true?

• The interval contains 0.178

• A 95% confidence interval includes 0.178

• The center of a CI at any level will be 0.178

• None of these are certain

When comparing a 95% CI with a 99% CI created from the same data, how will the intervals differ?

• The 99% interval will have a larger margin of error.
• The 95% interval will be wider than the 99% interval.
• The center of the 99% interval will be higher.
• The critical value for the 95% interval will be larger.

In a survey of 2480 golfers, 15% said they were left-handed.  The survey's margin of error was 3%.  Construct a confidence interval for the proportion of left-handed golfers.

• (0.18 , 0.21)
• (0.12 , 0.18)
• (0.12 , 0.15)
• (0.11 , 0.19)

Which of the following is NOT a parameter?

• μ

• σ

• p̂

• p

• N

What is the critical value?

• Margin of Error
• Point Estimate
• Z-Score
• Confidence Level

A random sample of 12 FVHS families are asked about their satisfaction with the school. A 95% CI is to be constructed for the proportion of satisfied families. Which of the following conditions is violated?

• Independence
• Randomness
• Normality
• All conditions are met.

Who's that pokémon?

• Munchlax

• Eevee

• Snorlax

• Gengar

• Jigglypuff

What state is this?

• Delaware

• Vermont

• New Hampshire

• New Jersey

• Massachusetts