Statistics - Review

The dotplot displays the total number of miles that the 28 residents of one street in a certain community traveled to work in one five-day workweek. Which of the following is closest to the percentile rank of a resident from this street who traveled 85 miles to work that week?

• 60

• 70

• 75

• 80

• 85

A large SRS of people aged 19 to 30 living in the state of Colorado was surveyed to determine which of two MP3 players just developed by a new company was preferred. To which of the following populations can the results of this survey be safely generalized?

• Only people aged 19 to 30 living in Colorado who were in this survey.

• Only people aged 19 to 30 living in Colorado

• All people living in Colorado

• Only people 19 to 30 living in the United States

• All people living in the United States

The probability of obtaining a head when a certain coin is flipped is about 0.65. Which of the following is closest to the probability that heads would be obtained 15 or fewer times when this coin is flipped 25 times?

• 0.14

• 0.37

• 0.39

• 0.60

• 0.65

The buyer for an electronics store wants to estimate the proportion of defective wireless game controllers in a shipment of 5,000 controllers from the store's primary supplier. The shipment consists of 200 boxes each containing 25 controllers. The buyer numbers the boxes from 1 to 200 and randomly selects six numbers in that range. She then opens the six boxes with the corresponding numbers, examines all 25 controllers in each of these boxes, and determines the proportion of the 150 controllers that are defective. What type of sample is this?

• Biased random sample

• Convenience sample

• Simple random sample

• Stratified random sample

• Cluster random sample

Which of the following scatterplots could represent a data set with a correlation coefficient of r = -1?

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• 
• 

A random sample of 25 households from the Mountainview School District was surveyed. In this survey, data were collected on the age of the youngest child living in each household. The histogram displays the data collected in the survey. In which of the following intervals is the median of these data collected?

• 0 to 2

• 4 to 6

• 6 to 8

• 8 to 10

• 10 to 12

Based on a random sample of 50 students, the 90 percent confidence interval for the mean amount of money students spend on lunch at a certain high school is found to be ($3.45, $4.15). Which of the following statements is true?

• 90% of the time, the mean amount of money that all students spend on lunch at this high school will be between $3.45 and $4.15.

• 90% of all students spend between $3.45 and $4.15 on lunch at this high school.

• 90% of all random samples of 50 students obtained at this high school would result in a sample mean amount of money students spend on lunch between $3.45 and $4.15.

• 90% of all random samples of 50 students obtained at this high school would result in a 90% confidence interval that contains the true mean amount of money students spend on lunch.

• Approximately 45 of the 50 students in the random sample will spend between $3.45 and $4.15 on lunch at this high school.

The data from how many students was recorded on this histogram?

• 43

• 4

• 60

• 15

What is the difference between a statistical question and one that is not statistical?

• The answers can show you how many of something.

• Answers of statistical questions have variability (many answers). Non-statistical have no variability (one answer).

• There are no answers to statistical questions.

• Statistical questions are harder!

3,4,7,6,8,7,9,3,7,4

What is the mode for this data set?

• 3

• 7

• 7.5

• 9