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Mashcka [7]
3 years ago
7

Jack lists all of the unique random samples of a certain sample size from a population. He then calculates the mean for each of

these unique random samples. Finally, he calculates a standard deviation of all the sample means. What is the correct notation and name for this standard deviation?
Mathematics
1 answer:
zimovet [89]3 years ago
5 0

Answer:

In this case Jack is only using a part or sample of the total population, so he is doing a sample standard deviation. When you use the total population you are doing a population standard deviation, otherwise, it’s always going to be the sample standard deviation.

Both deviations have different notations. The notation for this type of standard deviation (the one used by Jack) is:

"n" for the number of observations (lowercase)

"x-bar" for the average of the sample

"s" for the standard deviation

"s^2" for the variance

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3 years ago
Factor 6X to the fourth power minus 5X squared +12 X squared -10 by grouping what is the resulting expression
algol13

Answer:

(6x^2 - 5)(x^2 + 2).

Step-by-step explanation:

6x^4 - 5x^2 + 12x^2 - 10

= 6x^4 + 12x^2 - 5x^2 - 10

= 6x^2(x^ + 2) - 5(x^2 + 2)

(x^2 + 2) is common so we have:

(6x^2 - 5)(x^2 + 2).

5 0
3 years ago
What is the value of fraction 1 over 2x^3+3.4y when x=2 and y=5
Delvig [45]

Answer: 17 1/16

seventeen and one sixteenth

Step-by-step explanation:

Substitute x=2 and y=5 into equation

1/2x^3 + 3.4y

= 1/2(2)^3 + 3.4(5)

Solve in the order of BEDMAS (brackets, exponents, division, multiplication, addition, subtraction)

= 1/2(8) + 3.4(5)

= 1/16 + 3.4(5)

= 1/16 + 17

= 17 1/16

6 0
3 years ago
Please can someone help me??
jonny [76]

Your answer is 3450.


5% of 3000 is 150.

150 * 3 = 450

450 + 3000 = 3450 assuming the interest is not compound.

7 0
3 years ago
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