Chapter 7 Vocabulary Words Digital Flashcards

The entire group of objects or individuals considered for a survey

Population The entire group of objects or individuals considered for a survey

A part of the population

Sample A part of the population

A sample that does not fairly represent the population. Some are more likely to be chosen than others

Biased Sample A sample that does not fairly represent the population. Some are more likely to be chosen than others

A sample in which each individual or object in the entire population has an equal chance of being selected.

Random Sample A sample in which each individual or object in the entire population has an equal chance of being selected.

A sample based on members of the population that are readily available.

Convenience Sample A sample based on members of the population that are readily available.

A graph showing how data are distributed by using the median, quartiles, least and greatest value.

Box-and-Whisker Plot A graph showing how data are distributed by using the median, quartiles, least and greatest value.

The sum of the items in a data set divided by the number of items in the set. also called average

Mean The sum of the items in a data set divided by the number of items in the set. also called average

The middle number in an ordered data set

Median The middle number in an ordered data set

The number(s) that occur most often in a data set.

Mode The number(s) that occur most often in a data set.

The difference between the greatest and least values in a data set.

Range The difference between the greatest and least values in a data set. The range is 12 (29 – 17)

The median of the upper half of a data set

Upper Quartile The median of the upper half of a data set The upper quartile is 27

The median of the lower half of a data set

Lower Quartile The median of the lower half of a data set The lower quartile is 18

The difference between the upper and lower quartiles in a box-and-whisker plot.

Interquartile Range The difference between the upper and lower quartiles in a box-and-whisker plot. The interquartile range is 9 (27 – 18)

A value much greater or much less than the others in a the data set

Outlier A value much greater or much less than the others in a the data set

Quiz Objectives Match vocabulary words to their definition Given data, identify the mean, median, mode. Interpret and also create a box-and-whisker plot to find the median, range, and interquartile range. Compare box-and-whisker plots to determine which is more predictable and the best measure of central tendency. Determine if a sample is biased, random or convenience. Estimate population size using proportions

Practice Question 1 On the graph below, which box plot would be more predictable and why?

Practice Question 1 On the graph below, which box plot would be more predictable and why? The red box plot is more predictable because the data is more consistent. (the range and interquartile range are smaller)

Practice Question 2 Interpreting the graph below, what are the medians of each box plot?

Practice Question 2 Interpreting the graph below, what are the medians of each box plot? Blue box plot median is 54. Red box plot median is 51.

Practice Question 3 On the graph below, what is the difference between the medians?

Practice Question 3 On the graph below, what is the difference between the medians? The difference between the medians is 3 (54-51).

Practice Question 4 What is the upper and lower quartiles of each box plot?

Practice Question 4 What is the upper and lower quartiles of each box plot? Blue upper quartile is 59 and lower is 32. Red upper quartile is 65 and lower is 48.

Practice Question 5 What is the interquartile ranges of each box plot?

Practice Question 5 What is the interquartile ranges of each box plot? Blue interquartile range is 27 (59-32) Red interquartile range is 17 (65-48)

Practice Question 6 Analyzing the data below, what is the best measure of central tendency and why? 12, 12, 12, 13, 13, 14, 14, 98

Practice Question 6 Analyzing the data below, what is the best measure of central tendency and why? 12, 12, 12, 13, 13, 14, 14, 98 Median is the best measure of central tendency because there is an outlier which skews the data.

Practice Question 7 Is the sample biased, random, or convenience? Chloe surveys every third person entering the grocery store to find the average number of pets people own.

Practice Question 7 Is the sample biased, random, or convenience? Chloe surveys every third person entering the grocery store to find the average number of pets people own. Random

Practice Question 8 Is the sample biased, random, or convenience? The first 25 teenagers leaving Hollister are surveyed to find out what types of clothes girls like.

Practice Question 8 Is the sample biased, random, or convenience? The first 25 teenagers leaving Hollister are surveyed to find out what types of clothes girls like. Biased

Practice Question 9 Is the sample biased, random, or convenience? Mrs. Bade surveys only her advisory class to find out how many students buy or bring their lunch to school.

Practice Question 9 Is the sample biased, random, or convenience? Mrs. Bade surveys only her advisory class to find out how many students buy or bring their lunch to school. convenience

Practice Question 9b Is the sample biased, random, or convenience? Mrs. Bade surveys only her advisory class to find out how many students buy or bring their lunch to school. convenience Mrs. Bade surveys all of her classes to find out how many students buy or bring their lunch to school.

Practice Question 9b Is the sample biased, random, or convenience? Mrs. Bade surveys only her advisory class to find out how many students buy or bring their lunch to school. Biased and convenience Mrs. Bade surveys all of her classes to find out how many students buy or bring their lunch to school. Biased and convenience (The teacher does not teach all of the students in the school)

Practice Question 10 A small school has 200 total students. In a random sample of 50 students, 6 have the flu. Predict the number of people in the school who have the flu. 6= x 50200

Practice Question 10 A small school has 200 total students. In a random sample of 50 students, 6 have the flu. Predict the number of people in the school who have the flu. 6= x Approximately 24 people in the school have the flu.

Practice Question 10 A small school has 200 total students. In a random sample of 50 students, 6 have the flu. Predict the number of people in the school who have the flu. 50=6 200x Approximately 24 people in the school have the flu.

Practice Question 11 A small village has 500 total people. In a random sample of 50 people, 4 have the flu. Predict the number of people in the village who have the flu.

Practice Question 11 A small village has 500 total people. In a random sample of 50 people, 4 have the flu. Predict the number of people in the village who have the flu. 4= x 50500

Practice Question 11 A small village has 500 total people. In a random sample of 50 people, 4 have the flu. Predict the number of people in the village who have the flu. 4=x = 50x Approximately 40 people in the village have the flu.