Statistic
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Please help me with statistic I have listed an attachment I need to do Practice Problem 11, 12, 13, & 16 in the corresponding spaces below. Round your answers to 3 decimal places.
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11) For the following scores, find the (a) mean, (b) median, (c) sum of squared deviations, (d) variance, and (e) standard deviation:
2, 2, 0, 5, 1, 4, 1, 3, 0, 0, 1, 4, 4, 0, 1, 4, 3, 4, 2, 1, 0
So the mean would be: You add up all of the numbers, and divide by 21
= 42/21 = 2
The median is the number in the middle. So we first have to put the numbers in order from lowest to highest
0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 3, 3 4, 4, 4, 4, 4, ,5
There are 21 numbers, so the middle number is 11. The 11th number is 2 so that is the median
The sum of squares deviations
The formula is:
The sum of (each number - the mean) squared
(x-mean)squared
0 -2 4
0 -2 4
0 -2 4
0 -2 4
0 -2 4
1 -1 1
1 -1 1
1 -1 1
1 -1 1
1 -1 1
2 0 0
2 0 0
2 0 0
3 1 1
3 1 1
4 2 4
4 2 4
4 2 4
4 2 4
4 2 4
5 3 9
sum 56
Variance
To get variance it is the sum we got of the sum of squares deviations, /the sample size
= 52/21 = 2.476
Standard deviation is simply the square root of the variance = 1.57
12) For the following scores, find the (a) mean, (b) median, (c) sum of squared deviations, (d) variance, and (e) standard deviation:
1,112; 1,245; 1,361; 1,372; 1,472
So the mean would be: You add up all of the numbers, and divide by 5
= 6,562/5 = 1,312
The median is the number in the middle. So we first have to put the numbers in order from lowest to highest
1,112
1,245
1,361
1,372
1,472
There are 5 numbers, so the middle number is 3. The 3rd number ...
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