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53 Cards in this Set
- Front
- Back
a question that leads individuals towards a certain answer
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biased question
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a sample not representative of the entire population
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biased sample
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the group of individuals or items from which samples are taken
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population
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a sample in which every member of the population has an equal chance of being selected; unbiased sample
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random sample
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a small part of a population chosen to represent the entire group
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sample
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the collection, organization, and analysis of numerical information
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statistics
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a sampling of a population used to make predictions
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survey
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On a warm, sunny day, would you rather be outside enjoying the beautiful weather or just sitting inside reading a book?
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biased question example
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An unbiased question should give no indication as to what the surveyor's answer would be.
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true
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A sample is a small group that is used to represent the opinions of the entire group
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true
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The entire group is called the population.
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true
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every member of the population has an equal chance of being in the sample.
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true
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putting all the student's names into a box and drawing out twenty names.
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example of a random sample
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Susie surveyed several randomly selected students at school to find out whether they prefer walking, running, swimming, or biking. The results of her survey showed that 8 students prefer walking, 11 prefer running, 14 prefer swimming, and 7 prefer biking. What fractional part of the sample prefers to swim?
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First, you need to find the total number of students in the sample. To do that, add the students from each of the four groups:
8 + 11 + 14 + 7 = 40 So there are 40 students in Susie's sample and 14 of them prefer to swim. As a fraction, 14/40 or 7/20 would rather swim. |
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Any sample from a group of people will be representative of the entire group.
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false
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A biased sample is one in which every member of the group has an equal chance of being chosen.
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false
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Biased questioning will probably result in inaccurate survey results
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true
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The mean, median, and mode are all measures of central tendency.
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true
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the mean median and mode are called measures of central tendency they describe the "center" of the data.
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true
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having two modes
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bimodal
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ways to describe or summarize data
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central tendency
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information (often numerical)
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data
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the sum of a set of data divided by the number of items in the set
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mean
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the middle value of a set of data arranged in numerical order
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median
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the most frequently occurring number(s) in a set of data
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mode
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data represented by quantities
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numerical data
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The mean is probably the most commonly used measure of central tendency
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true
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the mean is found by adding all of the numbers in the set and then dividing by the number of items in the set
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true
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the mean = sum of numbers over the number of items
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true
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The median is the measure of central tendency that tells you what the middle value of the data is.
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true
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The best way to find the median is to line up the data from the smallest value to the largest value. Then find the value that cuts the data into two equal parts.
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true
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The median is the middle value of a set of data or the value that cuts the data into two parts.
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true
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There can't be two medians in a set of data, so in this case, the mean of the two middle numbers is the median.
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true
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The mode is the easiest of the three measures to find
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true
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the mode represents the value that occurs most frequently in the set of data
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true
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Unlike the median, it is possible to have more than one mode. In fact, it's even possible to have no mode.
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true
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The mean, the median, and the mode of a set of numbers can sometimes be equal to each other.
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true
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a value that is far removed from the rest of the values in a set of data
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outlier
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The only measure that is directly affected by an outlier is the mean
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true
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how data is distributed
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dispersion
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the difference between the upper quartile and the lower quartile
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interquartile range
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median of the lower half of a set of data
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lower quartile
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division of data into four equal parts
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quartile
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the difference between the largest and smallest data points
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range
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median of the upper half of a set of data
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upper quartile
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The range of a set of data is the distance, or difference, between the highest value in the set and the lowest value in the set. It shows how far apart the data lie.
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true
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range = largest value - smallest value
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true
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Is the range affected by outliers?
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yes
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put the values in numerical order, then subtract the lower value from the higher value to find the range
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true
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upper half of the data is called the upper quartile
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true
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the lower half of the data is called the lower quartile
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true
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you can also find the range of the upper and lower quartiles. This range is called the interquartile range, and it's the difference between the upper quartile and the lower quartile.
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true
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To find the interquartile range:
1.put the set in numerical order; 2.find the median of the data 3.find the median of both the upper and lower halves of the data; 4.subtract the lower quartile from the upper quartile. |
true
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