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4 years ago

Suppose your statistics professor reports test grades as z-scores, and you got a score of 2.20 on

1 answer:

4 0

This means that you got 2.2 standard deviations above the mean... This is certainly good, but the measure of exactly <em>how </em>good it is depends on the mean, and 1 standard deviation.

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The salary scale for a senior officer starts at N57000

katrin [286]

Answer:

N1,052,800.

Step-by-step explanation:

The starting salary of the officer = N57,000

Increase per annum =N2,800

The given pattern forms an arithmetic sequence since the annual salary increases by a fixed amount.

We are to determine the total amount of money that the officer will earn in 14 years.

Sum of an arithmetic sequence, $S_n=\frac{n}{2}[2a+(n-1)d]$ ,where: \left\{\begin{array}{lll}$First term, a=57,000\\$Common difference, d=2,800\\$Number of terms, n=14\end{array}\right$

$S_{14}=\frac{14}{2}[2(57,000)+(14-1)(2,800)]\\=7[114,000+13*2800]\\=7[150,400]\\=1,052,800$

At the end of 14 years, the total amount earned by the officer will be N1,052,800.

5 0

3 years ago

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population

postnew [5]

Answer:

We have been given confidence interval 95%, mean 20 , data set 30 and standard deviation 3.

We will use the formula: $mean\pm \frac{\sigma}{\sqrt{n}}\cdot (z-score)$

Here, $mean=20,\sigma=3,n=30,z-score=1.96$

Z-score value at 95% confidence interval is 1.96

On substituting the values in the formula to plug the values:

$20\pm\frac{3}{\sqrt{30}}\cdot (1.96)$

Now, we have a formula for marginal error: $z\cdot \frac{\sigma}{\sqrt{n}}$

Marginal error means your answer will be within that percentage only.

Say you have 3% marginal means your value will be within 3% real population 95% of the time.

7 0

4 years ago

The inequality 500−2.5t<100 an be used to determine the time t in seconds, after which there will be less than 100 gallons of

gregori [183]

Answer:

why yall put cheese on my cheeseburger

Step-by-step explanation:

why did you

6 0

3 years ago

A man starts repaying a loans with first insfallameny of rs.10 .If he increases the instalment by Rs 5 everything months, what a

zepelin [54]

Answer:

30×5=150

so 150+10=160

thus his payment in the 30th installment is

rs.160

4 0

3 years ago

204 thousands equals? What?

Furkat [3]

204 thousands equals to 204, 000 as the mathematical value and expression.

In expanded form
200, 000 + 4, 000 = 204, 000

In word form,
Two hundred and four thousand

6 0

3 years ago