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Citrus2011 [14]
3 years ago
9

SOMEONE PLEASE HELP I DONT KNOW THIS

Mathematics
1 answer:
Maslowich3 years ago
6 0
It says is x less than 3 or is x greater than 10

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A copyeditor thinks the standard deviation for the number of pages in a romance novel is six. A sample of 25 novels has a standa
alina1380 [7]

Answer:

No, the standard deviation for number of pages in a romance novel is six only.

Step-by-step explanation:

First we state our Null Hypothesis, H_o : \sigma = 6

             and Alternate Hypothesis, H_1 : \sigma > 6

We have taken these hypothesis because we have to check whether our population standard deviation is higher than what editor hypothesized of 6 pages in a romance novel.

Now given sample standard deviation, s = 9 and sample size, n = 25

To test this we use Test Statistics = \frac{(n-1)s^{2} }{\sigma^{2} } follows chi-square with (n-1) degree of freedom [\chi ^{2}_n__-1]

       Test Statistics = \frac{(25-1)9^{2} }{6^{2} } follows \chi ^{2}_2_4  = 54

and since the level of significance is not stated in question so we assume it to be 5%.

Now Using chi-square table we observe at 5% level of significance the \chi ^{2}_2_4 will give value of 36.42 which means if our test statistics will fall below 36.42 we will reject null hypothesis.

Since our Test statistics is more than the critical value i.e.(54>36.42) so we have sufficient evidence to accept null hypothesis and conclude that our population standard deviation is not more than 6 pages which the editor hypothesized.

8 0
3 years ago
What is a scatter plot
Firdavs [7]

Answer:


A scattergraph is a type of mathematical diagram using Cartesian coordinates to display values for typically two variables for a set of data. If the points are color-coded you can increase the number of displayed variables to three.

Image may be blurry.


6 0
3 years ago
How do find the median and range..?<br><br> give examples!
swat32

Answer:

Count how many numbers you have. If you have an odd number, divide by 2 and round up to get the position of the median number. If you have an even number, divide by 2. Go to the number in that position and average it with the number in the next higher position to get the median.

The range is calculated by subtracting the lowest value from the highest value.
Step-by-step explanation:

hope this helped!

7 0
3 years ago
Read 2 more answers
Fill in the blank. (5 + 2) × 10 = (5 × 10) + (2 × __ )
satela [25.4K]

Answer:

70=50+3.5=70 therefore the answer is 3.5

3 0
3 years ago
a tree casts a shadow that is 18 feet in length. If the angle of elevation is 28 degrees, which of the following best represents
pishuonlain [190]
Check the picture below

make sure your calculator is in Degree mode.

3 0
4 years ago
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