AP Statistics Review - Alexander Simionescu Period 1

Ch. 1: Statistics is the science of....

• data

• percents

• individuals

• conditional probabilities

Ch. 1: Which of the following is correct variables of statistics with the correct interpretations?

• Categorical - have a numerical value that measure some type of characteristics of the individual

  Quantitative - place each individual into a category or group

• Categorical - place each individual into a category or group

  Quantitative - have a numerical value that measure some type of characteristics of the individual

Ch. 1: True or false

Quantitative data can be placed into pie charts and bar graphs

• True

• False

Ch. 1: Which of the following demonstrates the differences between a frequency table and a relative frequency table?

• a frequency table and a relative frequency table are the same

• a frequency table uses categorical data, whereas a relative frequency table uses quantitative data

• a frequency table deals with counts, whereas a relative frequency table deals with percentages

• a frequency table deals with percentages, whereas a relative frequency table deals with counts

Ch. 1: Which of the following describes a situation when an association between two variables change or reverse when the data for all the values of the third variable combined?

• Hawthorne Effect

• Causation

• Correlation

• Simpson's Paradox

Ch. 1: True or false

Median and IQR are resistant measures when an outlier is present

• True

• False

Ch. 2: What is a z-score?

• the number of scores away from the mean value

• the number of units away from the mean value

• the number of variances away from the mean value

• the number of standard deviations away from the mean value

Ch. 2: Transforming Data

Which of the following is correct?

• Adding/subtracting to all the values in a data set increases/decreases the mean, median, and locations (quartiles and percentiles) by whichever constant you added/subtracted. However, the measures of spread and shape of the distribution DO NOT change

• Multiplying/dividing to all the values in a data set increases/decreases the mean, median, locations (quartiles and percentiles), and the measures of spread by whichever constant (if negative, make it into a positive for the measures of spread) you multiplied/divided. However, the shape of the distribution DO NOT change

• Adding/subtracting to all the values in a data set increases/decreases the mean, median, locations (quartiles and percentiles), and the measures of spread by whichever constant you added/subtracted. However, the shape of the distribution DO NOT change

• Multiplying/dividing to all the values in a data set increases/decreases the mean, median, and locations (quartiles and percentiles) by whichever constant you mulitplied/divided. However, the measures of spread and shape of the distribution DO NOT change

Ch. 2: What is correct percentages for the Empirical Rule?

• 60-95-99

• 34-95.6-99.7

• 68-95-99.7

• 50-70-99

Ch. 2: Which of the following is true?

• μ is used to represent the mean of a sample

• x-bar is used to represent the mean of a population

• 𝜎 is used to represent the standard deviation of a population

• Sx is used to represent the standard deviation of a population