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3 years ago

Super easy 1 question (8) just being lazy

Mathematics

1 answer:

Snezhnost [94]3 years ago

6 0

is this a school qustion? if not

cool me too

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(Small sample confidence intervals for a population mean) suppose you are taking a sampling of 15 measurements. you find that x=

Luda [366]

Answer:

The 99% confidence interval is $71.67 < \mu < 78.33$

Step-by-step explanation:

From the question we are told that

The sample size is $n = 15$

The sample mean is $\= x = 75$

The standard deviation is $s = 5$

Given that confidence is 99% then the level of significance is mathematically represented as

$\alpha = 100 - 99$

$\alpha = 1\%$

$\alpha = 0.01$

Next we obtain the critical values of $\frac{ \alpha }{2}$ from the normal distribution table

The value is

$Z_{\frac{ \alpha }{2} } = 2.58$

Generally the margin for error is mathematically represented as

$E = Z_{\frac{ \alpha }{2} } * \frac{ s}{ \sqrt{n} }$

=> $E = 2.58 * \frac{ 5}{ \sqrt{15} }$

=> $E = 3.3307$

The 99% confidence interval is mathematically represented as

$\= x -E < \mu < \= x +E$

=> $75 - 3.3307 < \mu$

=> $71.67 < \mu < 78.33$

3 0

3 years ago

Question17................

adelina 88 [10]

Galaxy B has more stars. When expanded, Galaxy A has 50,000,000 stars, while Galaxy B has 20,000,000,000 stars. Galaxy A has 2.5*10⁻³ times as many stars as Galaxy B. Galaxy B has 4*10² times as many stars as Galaxy A.

6 0

3 years ago

First right=brainliest:)))

Sophie [7]

Answer:

-4,7

Step-by-step explanation:

add both to get y=7

then sub y in 2 to get 8x+42=10

8x=-32

x=-4

3 0

3 years ago

For which pairs of functions is f(g(x))=x?

Nastasia [14]

The answer is B.
Hope that helps!
Good luck

5 0

3 years ago

Read 2 more answers

5y-6=3y-20 how do i solve this problem

rusak2 [61]

Minus 3y both sides
2y-6=-20
add 6 to both sids
2y=-14
divide 2
y=-7

7 0

4 years ago

Read 2 more answers