Review!

• the probability of event B happening given that event A already happened

• the probability of event A happening given that event B already happened

• the probability of event A or B happening

• the probability of event A and B happening

Review!

• exact y-value

• predicted y-value

• y-value from a sample

• y is Mrs. Keelen making us do this?

What does the symbol represent?

• n ot gonna answer this one

• sample size

• population size

• sampling distribution size

What does the symbol represent?

• standard deviation from a sample

• standard deviation of the sampling distribution of sample proportions

• standard deviation of the sampling distribution of sample standard deviations

• standard deviation from a population

The school board in a certain school district obtained a random sample of 200 residents and asked if they were in favor of raising property taxes to fund the hiring of more teachers. The resulting confidence interval for the population proportion of residents in favor of raising taxes was (0.183, 0.257). Which of the following is the margin of error for this confidence interval?

• 0.037

• 0.074

• 0.183

• 0.220

• 0.257

A state agency wants to survey 1500 registered voters about an upcoming election. The agency randomly selects 50 registered voters from each of the state's 30 senatorial districts. Which type of sample was selected by the state agency?

• Simple Random Sample

• Stratified Random Sample

• Cluster Sample

• Systematic Random Sample

• Convenience Sample

The distribution of the number of cars X parked in a randomly selected residential driveway on any night is given by the discrete probability distribution. What is the expected value of X?

• 1.00

• 1.45

• 1.95

• 2.00

• 2.05

• The approximate sampling distribution would be more variable.

• The approximate sampling distribution would be less variable.

• The approximate sampling distribution would have more dots.

• The approximate sampling distribution would have fewer dots.

• The approximate sampling distribution would be centered at 0.5.

A survey of 100 high school students was conducted. Each member of the sample was asked two questions: "Are you in 12th grade?" and "Do you have a driver's license, a learner's permit, or neither?" Overall, 23 members of the sample were in 12th grade. Also, 33 members of the sample had a driver's license and 12 had a permit. Assuming there is no association between grade and driving status in the population of high school students, what is the expected number of 12th graders with a driver's license?

• 7.59

• 15.41

• 25.41

• 56

• Impossible to determine without more information.

A random sample of 100 students from a large high school was surveyed about transportation to school. Students were asked to estimate the total amount of time (in minutes) it took them to get to school on a typical day and their method of transportation. The histograms summarize distribution of travel time for the 40 students who ride the bus and the 60 students with other forms of transportation? a) Compare these distributions. b) Is it possible that the median travel time is the same for both groups? Justify your answer.