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inysia [295]
1 year ago
14

A sample with a mean of m = 40 and a variance of s2 = 20 has an estimated standard error of 1 point. how many scores are in the

sample? group of answer choices 4 5 20 21
Mathematics
1 answer:
tamaranim1 [39]1 year ago
3 0

The correct option is 20.

The score found for the sample is 20.

<h3>What is Standard error?</h3>

A standard error is a statistic that is applied to test the distribution of data. This metric is comparable to standard deviation. We can calculate the standard error if we know the sample size & standard deviation. It assesses the mean's precision.

Now, according to the question;

Sample mean; \bar{x}=40

Sample variance; s^{2}=20

Thus, s=\sqrt{20}=4.47

Standard error SE = 1

The amount of scores with in sample must be determined here.

The standard error formula is as follows:

S E=\frac{s}{\sqrt{n}}

We might rearrange the formula as follows:

\begin{aligned}\sqrt{n} &=\frac{s}{S E} \\n &=\left(\frac{s}{S E}\right)^{2}\end{aligned}

Substituting the values;

\begin{aligned}&n=\left(\frac{4.47}{1}\right)^{2} \\&n=19.98\end{aligned}

The sample's number of scores n = 19.98 = 20 (round up)

Therefore, the scores are in the sample is 20.

To know more about the Standard error, here

brainly.com/question/14467769

#SPJ4

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Answer:

1. line a and c and parallel. line b is perpendicular with line a and c. 2. line b and c and parallel. line a is perpendicular to lines b and c. 3. y= -3x + 3 4. y=(5/3)x - 9

Step-by-step explanation:

To find parallel and perpendicular, make the slope opposite and find b by plugging in the points. Parallel is the same slope.

5 0
3 years ago
Josie is making pizza dough. Complete the double number line by filling in the missing values
Softa [21]

Answer:

n = \frac{4}{3}c

c:0\ \ \ \frac{3}{4}\ \ \ \frac{3}{2}\ \ \ \frac{9}{4}\ \ \ 3\ \ \ 3\frac{3}{4}\\n:0\ \ \ \ 1\ \ \ 2\ \ \ 3\ \ \ \ 4\ \ \ \ 5

Step-by-step explanation:

Given

See attachment for complete question

Required

Complete the double number line

The given double number lines represent a linear function between cups of flour (c) and number of batched (n)

Pick any two pairs:

(c_1,n_1) = (\frac{3}{4},1)

(c_2,n_2) = (3\frac{3}{4},5)

First, calculate the rate of change (i.e. slope, m):

m = \frac{n_2 - n_1}{c_2 - c_1}

m = \frac{5-1}{3\frac{3}{4} - \frac{3}{4}}

m = \frac{4}{3}

So: the equation is:

n = m(c - c_1) + n_1

This gives:

n = \frac{4}{3}(c - \frac{3}{4}) + 1

n = \frac{4}{3}c - 1 + 1

n = \frac{4}{3}c

So, the above represents the relationship between n and c.

<u>To complete the table</u>

When n = 2

Substitute n = 2 in: n = \frac{4}{3}c

2 = \frac{4}{3}c

Make c the subject

c = \frac{3*2}{4}

c = \frac{3}{2}

When n = 3

Substitute n = 3 in: n = \frac{4}{3}c

3 = \frac{4}{3} * c

Make c the subject

c = \frac{3*3}{4}

c = \frac{9}{4}

When c=3

Substitute c=3 in: n = \frac{4}{3}c

n = \frac{4}{3} * 3

n = 4

So, the complete table is:

c:0\ \ \ \frac{3}{4}\ \ \ \frac{3}{2}\ \ \ \frac{9}{4}\ \ \ 3\ \ \ 3\frac{3}{4}\\n:0\ \ \ \ 1\ \ \ 2\ \ \ 3\ \ \ \ 4\ \ \ \ 5

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2 years ago
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Lelechka [254]

Answer:0.43 hours

Step-by-step explanation:

15

miles

35

miles

hour

=

5

⋅

3

5

⋅

7

hours

=

3

7

hours

=

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