1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vagabundo [1.1K]
3 years ago
15

Geometry !!! Pls help it’s timed!!

Mathematics
1 answer:
DENIUS [597]3 years ago
6 0

Answer:

the answer is the first choice .

You might be interested in
Suppose we are interested in analyzing the weights of NFL players. We know that on average, NFL players weigh 247 pounds with a
tigry1 [53]

Answer:

SE= \frac{\sigma}{\sqrt{n}} = \frac{47}{\sqrt{30}}= 8.58

ME= 1.64 *\frac{\sigma}{\sqrt{n}} = 1.64*\frac{47}{\sqrt{30}}= 14.073

\bar X - ME = 237- 14.073 = 222.927

\bar X + ME = 237+ 14.073 = 251.073

n=(\frac{1.640(47)}{5})^2 =237.65 \approx 238

So the answer for this case would be n=238 rounded up to the nearest integer

Null hypothesis:\mu \geq 247  

Alternative hypothesis:\mu  

z=\frac{237-247}{\frac{47}{\sqrt{30}}}=-1.165  

p_v =P(z  

If we compare the p value and the significance level given \alpha=0.1 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can't conclude that the true mean is lower than 247 at 10% of significance.

Step-by-step explanation:

For this case we have the following data given:

\bar X =237 represent the sample mean

\sigma = 47 represent the population deviation

n =30 represent the sample size selected

\mu_0 = 247 represent the value that we want to test.

The standard error for this case is given by:

SE= \frac{\sigma}{\sqrt{n}} = \frac{47}{\sqrt{30}}= 8.58

For the 90% confidence the value of the significance is given by \alpha=1-0.9 = 0.1 and \alpha/2 = 0.05 so we can find in the normal standard distribution a quantile that accumulates 0.05 of the area on each tail and we got:

z_{\alpha/2}= 1.64

And the margin of error would be:

ME= 1.64 *\frac{\sigma}{\sqrt{n}} = 1.64*\frac{47}{\sqrt{30}}= 14.073

The confidence interval for this case would be given by:

\bar X - ME = 237- 14.073 = 222.927

\bar X + ME = 237+ 14.073 = 251.073

The margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (a)

And on this case we have that ME =5 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=(\frac{z_{\alpha/2} \sigma}{ME})^2   (b)

Replacing into formula (b) we got:

n=(\frac{1.640(47)}{5})^2 =237.65 \approx 238

So the answer for this case would be n=238 rounded up to the nearest integer

State the null and alternative hypotheses.  

We need to conduct a hypothesis in order to check if the true mean is lower than 247 pounds, the system of hypothesis would be:  

Null hypothesis:\mu \geq 247  

Alternative hypothesis:\mu  

Since we know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:  

z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}} (1)  

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".  

Calculate the statistic  

We can replace in formula (1) the info given like this:  

z=\frac{237-247}{\frac{47}{\sqrt{30}}}=-1.165  

P-value  

Since is a left tailed test the p value would be:  

p_v =P(z  

Conclusion  

If we compare the p value and the significance level given \alpha=0.1 we see that p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can't conclude that the true mean is lower than 247 at 10% of significance.

5 0
3 years ago
Kiersten runs a website that helps people learn to programme. Every month, Kiersten receives a subscription fee of a 10 from eac
blondinia [14]
1,200?? I'm not really sure tho
6 0
3 years ago
Braden biked 10 8/9 miles on Monday. On Tuesday, he biked 3/ 4 as far as Monday. How many total miles did he bike over the two d
torisob [31]

Answer:

19 1/18 miles.

Step-by-step explanation:

For Tuesday's ride we need to multiply 10 8/9 by 3/4.

10 8/9 = (9*10+8) / 9 =  98/9 miles.

98 / 9  * 3/4

= 98/3 * 1/4

49/6

= 8 1/6 miles.

Total miles over 2 days = 10 8/9 + 8 1/6

= 18 + 8/9 + 1/6

= 18 +  48/54 + 9/54

= 18 57/54

= 19 3/54

= 19 1/18 miles.

5 0
3 years ago
Which relation is a function?<br>Do Not Post A Link.​
Schach [20]
the one that starts with (-2,-2)
5 0
3 years ago
What is the square root of 56 in radical form
V125BC [204]
\sqrt{56}  \\  \\  \sqrt{7*8}  \\  \\  \sqrt{7*4*2}  \\  \\  \sqrt{7*2*2*2}  \\  \\ 2 \sqrt{7*2}  \\  \\ 2 \sqrt{14}
7 0
3 years ago
Other questions:
  • Is 4,234 rounded to the nearest ten thousand 0?
    8·2 answers
  • You roll a pair of fair six-sided dice. The sample space of 36 possible outcomes is shown below. Based on this information, answ
    15·1 answer
  • 8/3 + 3/4 equals...
    6·2 answers
  • What is the domain of the following relation?<br> {(a, b), (b, c), (c, a), (a, c), (c, d)}
    15·2 answers
  • What is m&lt;1 equal to
    11·1 answer
  • There are 7 oak trees currently in the park park workers had to cut down 2 oak trees that were damaged how many oak trees will b
    11·2 answers
  • Angles A and B are complementary. What is mB if mA = 15°? A. 75° B. 90° C. 105° D. 165°
    11·2 answers
  • PLEASE HELP DUE TODAY!! WILL GIVE BRAINLINESS!!
    11·1 answer
  • (Worth 11 points) I have this semester a unit test and i reallllllly need help wif this question, I will mark you. But im really
    9·2 answers
  • Evaluate the expressions.<br> (-7)⁰ = 0<br> 0<br> 2²( ³ ) = 0<br> 5<br> 010<br> X<br> Ś
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!