The result of 146 chemical reactions gave yields with a standard deviation of 4.864 mol.
What is the standard error of the mean?
Select one:
a. SE = 0.403 mol
b. SE = 0.015 mol
c. SE = 0.033 mol
d. SE = 0.162 mol
e. SE = 23.658 mol
f. SE = 4.864 mol

a. SE = 0.403 mol

Step-by-step explanation:

The standard error of the mean, is the standard deviation of means of means.

It is calculated using,

We have the standard deviation to be

and the sample size is n=146.

We substitute the values to get:

We approximate to three decimal places to get:

sin3a=12/15

step-by-step explanation:

since one side was multiplied by 3 the other side must also be multiplied by 3.

region b will make the inequalities y < 2x + 1 and y > -x - 2 true ⇒ answer a

step-by-step explanation:

* lets study the graph and the inequality to solve the question

- the inequality y > -x - 2

∵ the form of the inequality is y > mx + c , m is the slope of the line

  and c is the y-intercept (the line intersect y-axis at point (0 , c)

∴ c = -2 that means the line intersect the y-axis at point (0 , -2)

∵ the sign of the inequality is >

∴ we shad the part over the line

  region a and b

- the inequality y < 2x + 1

∵ the form of the inequality is y > mx + c , m is the slope of the line

  and c is the y-intercept (the line intersect y-axis at point (0 , c)

∴ c = 1 that means the line intersect the y-axis at point (0 , 1)

∵ the sign of the inequality is <

∴ we shad the part under the line

  region b and c

∵ the common region between the two lines is region b

∴ region b will make the inequalities y < 2x + 1 and y > -x - 2 true