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BIO215 Lab 3 Pre-lab questions
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sdsu
Terms in this set (19)
define SUMS
S-SHAPE
U- UNUSUAL
M- MIDDLE
S- SPREAD
S-SHAPE
what is the overall shape of the distribution?
Ex) Symmetry, asymmetry, unimodal, or bimodal, flat, peak, mound shape)
U-UNUSUAL
are there any unusual points?
Ex) errors, outliers, influential observations
M-Middle
where is the center of the distribution?
Ex)Mode, average, mean, median)
S-Spread
How much variation is there? Ex) range, IQR, variance, standard deviation
What are the two components of shape?
Kurtosis and Symmetry
Define Kurtosis?
the "peakedness" or flatness of the distribution
3 types: flat, mound (unimodal, and bimodal (with 2 peaks)
Define symmetry
symmetry between 2 halves of distribution
when the distribution is asymetrical = skewed
how to find the median?
Put all the numbers in numerical order.
If there is an odd number of results, the median is the middle number.
If there is an even number of results, the median will be the mean of the two central numbers.
define Unusual points
points that are separated from the rest of the observation
define mean and how to find it
sum of the values in a sample divided by sample size
define range
spread between the smallest and largest values
(Largest number - smallest number)
Define "IQR" Inter-Quartile Range...
distance between upper nad lower quartile of sample
IQR=Q3-Q1
A dataset consist of the following 5 points: 3,5,6,8,9. calculate the mean
6.2
A dataset consist of the following 5 points: 3,5,6,8,9. calculate the median
6
a data set consist of the following 5 points 3,5,6,8, 39. find mean
12.2
a data set consist of the following 5 points 3,5,6,8, 39. find median
6
a dataset consisting of the following 5 points 3,5,12, 6,14, 8, 2, 9. find mean
7.375
a dataset consisting of the following 5 points 3,5,12, 6,14, 8, 2, 9. find median
7
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