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
Feliz [49]
3 years ago
15

Please help thanks :)

Mathematics
1 answer:
maxonik [38]3 years ago
6 0
Hello!

The answer is 50°

Hope this helps!
You might be interested in
Has the marrying age of a man changed over the years? The United States Bureau of the Census takes a formal count of everyone in
ch4aika [34]
The answer to your question is B
5 0
2 years ago
The point (0,0) is a solution to which of these inequalities?
Gre4nikov [31]
It is the solution for B
3 0
3 years ago
My brother wants to estimate the proportion of Canadians who own their house.What sample size should be obtained if he wants the
AVprozaik [17]

Answer:

a) n=\frac{0.675(1-0.675)}{(\frac{0.02}{1.64})^2}=1475.07

And rounded up we have that n=1476

b) n=\frac{0.5(1-0.5)}{(\frac{0.02}{1.64})^2}=1681

And rounded up we have that n=1681

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The population proportion have the following distribution  

p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})  

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}} (a)  

If solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2} (b)  

Part a

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 90% of confidence, our significance level would be given by \alpha=1-0.9=0.1 and \alpha/2 =0.05. And the critical value would be given by:  

z_{\alpha/2}=\pm 1.64  

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

And on this case we have that ME =\pm 0.02 and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)  

And replacing into equation (b) the values from part a we got:

n=\frac{0.675(1-0.675)}{(\frac{0.02}{1.64})^2}=1475.07

And rounded up we have that n=1476

Part b

For this case since we don't have a prior estimate we can use \hat p =0.5

n=\frac{0.5(1-0.5)}{(\frac{0.02}{1.64})^2}=1681

And rounded up we have that n=1681

8 0
3 years ago
On a long distance bike trip Annike started at 7 a.m and her average speed was 11 miles per hour and Celia travels 14 miles per
Troyanec [42]

Answer:

Annike's bike trip started at 7:00, if she and Celia both start at the same time you would multiply Annike's average speed by Celia's average speed to find where they would have completed the same number of miles

equation: 11×14=154 14×11=154

Step-by-step explanation:

counting by 11:

11 22 33 44 55 66 77 88 99 110 121 132 143 <em><u>154</u></em>

11 × 14 = 154

counting by 14:

14 28 42 56 70 84 98 112 126 140 <em><u>154</u></em>

14 × 11 = 154

8 0
3 years ago
1/4Wpw ww - 1/4BbwBwv - 1/4Ga Vw Gap<br><br> WTH help plz
Dima020 [189]

Answer:

Can you explain the question lol in so confused

Step-by-step explanation:

8 0
2 years ago
Other questions:
  • Whats the indicated operation?
    12·1 answer
  • Hello! I'm stuck on Pythagorean theorem in geometry. There are some numbers that suppose to have a line on top but I don't know
    15·1 answer
  • A clock on sale for $215 was regularly priced at $565 find the percent of discount
    15·1 answer
  • Answers 1-8 ? Please and thankyou.
    9·1 answer
  • Find the sum of the given vectors and illustrate geometrically. [-2,-1],[5,7]
    11·1 answer
  • What is 1/2 (2n+6) = 5n - 12 - n
    12·1 answer
  • Which sentences are punctuated correctly? Select 2 options.
    5·2 answers
  • Bryson bought 2_3/4
    15·1 answer
  • Hello please help me solve this :) will give braisnlt
    14·2 answers
  • 30÷4<br><br><br><br>pls show the working ​
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!