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The median divides a data set into two halves. The set of numbers below the median is called the LOWER HALF and the set of numbers above the median is called the UPPER HALF. The median of the lower half is called the FIRST QUARTILE and is indicated by Q1; the THIRD QUARTILE, denoted by Q3, is the median of the upper half. The FIVE-NUMBER SUMMARY of a set of data values consists of the minimum value, Q1, median, Q3, and the maximum.
x+f frequency distribution table guide
(sum of x*f)/(sum of f)=mean
median of all x+f
mode is normal
five number summary -> medians of Q1 and Q3 DONT include true median
score/frequency table mean=(sum of all score*frequency)/sum of frequency
how far family is from the mean= 1. find mean of incomes 2. find standard deviation 3. subtract family X from the mean 4. divide by the standard deviation
68-95-99.7 questions
formula = x-mean/SD = 1, 2 or 3
"between"=divide the percentage by 2
"below"a low number or "above" a high number=(100-percentage)/2
"below" a high number or "above" a low number= percentage + ((100-percentage)/2)
how many k are expected to y for x min per day question:
1. use z score formula with the raw score being x. solve for z.
2. find z on the table and subtract it from .5
(stop there if its asking for a percentage)
3. multiply that by the total number of people
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