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uranmaximum [27]
3 years ago
6

Chegg Detecting acid rain: power by hand. Even though software is used in practice to calculate power, doing the work by hand in

a few examples will build your understanding of this concept. Find the power of the test in Exercise 15.41 for a sample of size n
Mathematics
1 answer:
Veseljchak [2.6K]3 years ago
4 0

Solution :

a). Standard error of sample mean =  $\frac{\sigma}{\sqrt n}$

                                                          $=\frac{0.5}{\sqrt{15}}$

                                                        = 0.1290994

The observed mean point be $\overline x$

Test statistics z = $\frac{\text{(observed mean - hypothesized mean)}}{\text{standard error}}$

                         $=\frac{\overline x -5}{0.1290994}$

For the left one sided test, critical value of z to reject $H_0 = -1.64$

We reject $H_0$ when test statics z < -1.64

b).  Value of  $\overline x$  z < -1.64

   $=\frac{(\overline x-5)}{0.1290994}

  $=\overline x  < 5-0.1290994 \times 1.64$

  $=\overline x < 4.78828$

∴ we reject $H_0$ when $\overline x < 4.78828$

c). The probability of rejecting $H_0$ when $\mu = 4.7$,

  $P(x

                            $=P(z

                           $=0.7517$

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Max goes to school which is 5 miles away he skips 3/14 of the way and then walk the rest of the way how many miles does he skip​
baherus [9]

Answer:

1.07142857143 (1 rounded)

Step-by-step explanation:

3/14 of 5 is 1.07142857143

8 0
2 years ago
PLEASE HELP!!!
viktelen [127]

The answer is 3/5.


\frac{1}{3} *\frac{3}{5} =\frac{3}{15} \\ \\ \frac{3}{15} *\frac{3}{5} =\frac{9}{75}


Continue this pattern and you'll see that it follows this geometric sequence

5 0
3 years ago
Read 2 more answers
The price of Stock A at 9 AM WAS $12.24. Since then, the price has been increasing at
expeople1 [14]

Answer:

Step-by-step explanation:

t is the number of hours

12.24+0.11t = 12.74-0.15t

0.11t + 0.15t = 12.74 - 12.24

0.26t = 0.5

t= 0.5/0.26

t= 1.92 hours

approx to 2 hours

3 0
2 years ago
At a fruit stand there are 12 strawberries, 30 blueberries, 16 apples , and 14 bananas. Which ratio expresses strawberries to al
jasenka [17]
It would be 12:72. Add all the numbers together to get the second number, and the first number would be 12, or the number of strawberries.
7 0
3 years ago
What is the average rate of change from x = −3 to x = −4?
Vika [28.1K]

Answer:

-2

Step-by-step explanation:

Since it would be immensely helpful to know the equation of this parabola, we need to figure it out before we can continue.  We have the work form of a positive upwards-opening parabola as

y=a(x-h)^2+k

where a is the leading coefficient that determines the steepness of lack thereof of the parabola, x and y are coordinates of a point on the graph, and h and k are the coordinates of the vertex.  We know the vertex: V(-3, -3), and it looks like the graph goes through the point P(-2, -1).  Now we will fill in the work form equation and solve for a:

-1=a(-2-(-3))^2-3

which simplifies a bit to

-1=a(1)^2-3

and

-1 = a(1) - 3.  Therefore, a = 2 and our parabola is

y=2(x+3)^2-3

Now that know the equation, we can find the value of y when x = -3 (which is already given in the vertex) and the value of y when x = -4.  Do this by subbing in the values of x one at a time to find y.  When x = -3, y = -3 so the coordinate of that point (aka the vertex) is (-3, -3).  When x = -4, y = -1 so the coordinate of that point is (-4, -1).  The average rate of change between those 2 points is also the slope of the line between those 2 points, so we will use the slope formula to find it:

m=\frac{-1-(-3)}{-4-(-3)} =\frac{2}{-1}=-2

And there you have it!  I'm very surprised that this question sat unanswered for so very long!  I'm sorry I didn't see it earlier!

5 0
3 years ago
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