AP Stats Unit

If no alpha level is given, what alpha level is assumed?

• 0.01
• 0.05
• 0.10
• 0.25

If no p^ value is given, what should you assume p^ equals?

• 0.01
• 0.05
• 0.10
• 0.5

Which of the following hypotheses is a valid example of a 1-tailed test?

• Ho: p = 0.3, Ha: p > 0.4
• Ho: p = 0.3, Ha: p ≠ 0.3
• Ho: p^ = 0.3, Ha: p^ > 0.3
• Ho: p = 0.3, Ha: p > 0.3

When leaving for school, you make a judgement on these hypotheses. Ho: The weather will remain dry. Ha: It will rain. What are the results of the Type I and Type II errors?

• Type I: Needlessly carry around an umbrella all day. Type II: Get drenched
• Type I: Get drenched. Type II: Needlessly carry around an umbrella all day
• Type I: Carry umbrella &  it rains. Type II: Carry no umbrella & it doesn't rain
• Type I: Get drenched. Type II: Carry umbrella & it rains

Tina wants to know if the proportion of people who buy burgers is at all affected by her open mic reading. If p=0.8 before her reading, what is an appropriate set of hypotheses?

• Ho: p = 0.8
  Ha: p > 0.8
• Ho: p = 0.8
  Ha: p < 0.8
• Ho: p ≠ 0.8
  Ha: p = 0.8
• Ho: p= 0.8
  Ha: p ≠ 0.8

Which of the following is true?

• We do not use sample statistics when stating hypotheses
• P-value = 0.05 means the probability that the null is true is 0.05
• If the p-value is small enough, we can conclude that the alternate hypothesis is true
• You must examine your data prior to deciding to do a 1- or 2-tailed test

Under what conditions would it be meaningful to construct a confidence interval estimate when the data consist of the entire population?

• If the population size is large (n > 30)
• If a higher level of confidence is desired
• If the population is truly random
• Never

A 99% confidence interval found that the true proportion of teens who drink coffee every day is in the interval (0.785, 0.831). What was the p^ value used to determine this interval? 

• 0.8
• 0.808
• 0.825
• 0.831

What is the z* value for a 88%confidence interval?

• 1.175
• 1.555
• 1.645
• 1.96

A test was conducted to see if there was evidence that more than 10% of the population is left-handed. Ho: p = 0.10, Ha: p >0.10. A p-value of 1.10 is found. What can we conclude?

• There is not evidence that more than 10% of people are left-handed
• We can conclude that more than 10% of people are left-handed
• There is evidence that more than 10% of people are left-handed
• The person who ran this test made an error