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...

Confidence Interval (answer)

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...

The standard normal distribution is also called the bell curve because of its shape. The idea is that you have the mean (which has a Z value of 0) and then three standard deviations to the right of the mean and three to the left. It looks like this: http://www.regentsprep.org/Regents/math/algtrig/ATS2/normal67...

Stem and leaf plots can be used in academic journals and publications. A newspaper like the Times probably wouldn't do it because their readers may not understand.

its complicated (answer)

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...

Simplify the expression (answer)

Negative 4p to the 4th power is 256 p. -4 *-4*-4*-4=256.

8x+6=4x+26 First, you want to get all the variables you are trying to solve for on one side so subtract 4x from both side 8x+6=4x+26 -4x -4x That leaves you with 4x+6=26 (because 4x-4x=0 so that term is eliminated) Next,...

1/x + 1/9 / 1xsquare - 1/3 (answer)

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...

i need homework help (answer)

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 what is x? (answer)

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...

how to find percentiles (answer)

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...

Statistics with chi square (answer)

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...