Describing graphs, spread..etc.
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| When would you use a bar graph? | When you have categorical Data
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| What is important about the shape of a bar graph? | It doesn't have one with respect to skewness..etc.
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| When would you use a histogram? | Greater than 40 numbers
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| When would use use a stem-plot or a dot-plot? | Less than 40 numbers
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| What two computed values are never apart? Correlation, mean, average, median, standard deviation | Mean and Standard Deviation
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| What is the first thing you do when you see quantitative data? | Plot it.
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| What are the three properties of a histogram? | Shape, Center, and Spread
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| What is always on the x axis of a scatter-plot? | The explanatory variable
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| What is always o the y axis of a scatter-plot? | The response variable
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| What is a lurking variable? | A third variable that has a strong impact on the other vvariables, but is not measured at this time...
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| What are the three things you need to know when data is symmetric? | mean=median, bell shaped, follows 68-95-99.7 rule
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| What is the symbolic representation of Normal distribution? | N(mean, S.D.)
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| Define: Variable | Any characteristic of the objects we study
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| What are the important characteristics of a graph? | There must be space between the vertical bars, each vertical bar represents a category, the height of a bar shows the quantity in that category or the percent of total. Also, segmented bar graphs exist
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| What are stem-plots used as opposed to dot-plots? | When you want to see all the numerical data
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| Tell me about stem-plots: | They have a leaf (tens digit) and a stem (ones digit), for data you want to see, from smallest to largest, a title, four or more stems=split them
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| Define: Shape | symetric or skewed, single or multiple peaks
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| Define: Center | middle of data
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| Spread | The highest or lowest values for the main part of data? Any Outliers
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| Why is the median better than the mean? | Because it is robust to outliers
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| When would you use the mean over the median? | When the data is symetric.
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| How do you measure the spread in data? | Using an average deviation
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| What does the average deviation measure? | The distance of a value from the mean
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| What is the relationship between spread and standard deviation? | The greater the spread of data the higher the standard deviation
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| What does the five number summary consist of? | # the minimum (smallest observation)# the lower quartile or first quartile (which cuts off the lowest 25% of the data)# the median (middle value)# the upper quartile or third quartile (which cuts off the highest 25% of the data)# the maximum
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| What is association? | The relationship of two variables. Measures the form, direction, and strength (correlation)
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| When would one use scatterplots? | When there are two quantitative variables
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| What should one do looking at a scatterplot? | Look for the overall pattern, describe the pattern by form, direction, and strength, and look for outliers
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| What is the symbolic representation of the correlation? | r
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| What does correlation measure? | Measures how strong the linear relationship between two variables is.
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| What are some conditions for correlation? | It has no units, between -1 to 1, the closer the correlation to 0, the weaker the linear relationshiop
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| How many decimal placese in a mean? | 1 More Decimal place than the data
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| S.D. decimal places? | two more than data
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| Z-score | Two decimals
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| percent decimal places | At least one
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| What is the formula for a Z-score | write out
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| What is the symbol for S.D. | Mu
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| What is the symbol for mean? | Sigma
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| What is a normal distribution: | Symetric with a single peak, the distinguishing characteristics between two normal distributions are the mean and s.d.
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talkglitter2486