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Answers by Zoltan B.

Sample: [34, 36, 39, 43, 51, 53, 62, 63, 73, 79]   N=10   Sum=533   Mean=533/10=53.3   Standard deviation=15.65   Standard Error= SE = standard deviation / sqrt( n )=15.65/square root of 10= 15.65/3.16=4.95   Critical...

If we assume that Nataliya is right and the question is (4x - 12) / (x2 + 4x - 21) We can simplify it like so (2x-3.46)/(x+2x-4.58): This takes the square root of your original equation      

Hi Zak,   I'm going to give you an example of stem-and leaf plotting. Suppose that you have a data set that's as follows: x={1, 2, 4, 5, 11, 15, 19, 20} The stem (left side), is the first digit of the data. The leaf (right side) is the second digit. So plotting the above...

Chris is right: Let's say x=10. Then we can plug in the numbers   1/10+1/9/1 times 10 squared minus 1/3   0.10+0.11/100 minus 0.33 0.10+0.001-0.33 0.1001-0.33  

This is difficult to answer without knowing the type of object but assume its a rectangle.   16 inches=area around the rectangle=sum of all four sides; for example if the length was 5 inches and the width was 3 inches, the area would be 5+3+5+3=16 The area would be the...

x2 - x - 12 = 0 First, you add 12 to both sides x2 - x = 12 Then you add x to both sides X2=12+x Then you fill in the blanks. Let's try 4 4 squared=16=12+4 Therefore x equals 4. Let's check this. x2 - x - 12 = 0 4squared-4-12=0 16-4-12=0 It...

4n-10n+35=1-2 (answer)

Do you mean "n" by itself? 4n-10n+35=1-2 First, add 2 to both sides 4n-10n+37=1 Then, combine your unknown variable: 4n-10n=-6n -6n+37=1 Then subtract 37 from both sides -6n=-36 Then divide by 6 -n=-6  

X+4=24    -4   -4 X=20   We subtracted four from each side. By subtracting 4, we transformed the equation to X+0=24-4 Because 4-4=0 and if we subtract four from the left side we need to subtract four from the right as well. 24-4=20 Therefore...

Calculate percentiles can tell us how numbers are distributed. Assume eight numbers: [0, 2, 4, 6, 8, 10, 12, 14] Notice that these 8 numbers are arranged from lowest to highest: That's how you need to arrange your numbers to calculate percentiles. If the numbers are not arranged lowest to...

Chi squared=(observed frequency - expected frequency) squared, divided by expected frequency.  Here, chi squared = 100.9, and you would use that as the sum of each variable's chi square. Each number in your table is an observed frequency. For instance 25 non white persons with private lawyers...