1.) Complete the multiple choice questions we started in class. This will be collected and graded as classwork, so don't forget (and get a 0)! A few hints...
- For #4, roman numeral II can be tricky--think about this...the median will fall directly in the middle. The mean will also be directly in the middle, unless it's pulled up or down by unusually high or low values. Are there any values that would "pull" the mean in any particular direction for this histogram?
- For #5....here's a different example showing how you would calculate the overall mean...
- Suppose two classes find the average heights of their students. Class 1 has 23 students and an average height of 66 inches. Class 2 has 19 students and an average height of 70 inches.
- To find the overall mean, we first multiply each sample size by it's mean: (23 x 66) + (19 x 70)
- Then, we take this sum, and divide by the total number of students (23 + 19).
2.) Describe the two histograms provided in class (or below), about Old Faithful Eruptions and Customer Service Times.
- You MUST write in complete sentences and thoroughly describe "SOCS" AND add the "Generally..." statement we discussed today in class. Use your notes from today as a guide!
- If your answers are short/incomplete (I see 2 sloppy sentences on your paper), you WILL NOT get credit for your homework.
3.) CHAPTER 4 VOCAB QUIZ MONDAY! (Use the glossary at the back of chapter 4 for definitions!). Here's the list:
- Distribution (shows all possible values of a variable and the (relative) frequencies for values)
- Skewed left/skewed right (skewed left: a distribution with most data on the right, with a few low values...skewed right you're on your own)
- Center (I did put it on here...) (a value that summarizes a distribution with one number; "typical value")
- Spread (a value that summarizes how data varies, or how clustered it is around the center)
- Outlier (a data point that is separated from/falls from from the rest of our data)
- Range (Max - Min)
- Median (the middle number)
- Mean (average--add all values and divide by the sample size)
- Quantitative Displays (dotplot, boxplot, stemplot, histogram, timeplot, ogive)
- Categorical Displays (pie chart, bar chart, frequency table)
- Statistics for Quantitative Data (mean, median, range, IQR, standard deviation)
- Statistics for Categorical Data (proportion/%)
- There is also one last question that shows a histogram and asks you to describe the shape.
(Here are the histograms to describe for homework in case you lost your paper or were absent):
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