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olga2289 [7]
3 years ago
10

Circle the statement that are tru as you solve

Mathematics
1 answer:
shepuryov [24]3 years ago
5 0
What statement are you talking about?
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Several years​ ago, 43​% of parents who had children in grades​ K-12 were satisfied with the quality of education the students r
Ne4ueva [31]
<h2><u>Answer with explanation</u>:</h2>

Let p be the population proportion of parents who had children in grades​ K-12 were satisfied with the quality of education the students receive.

Set of hypothesis :

H_0: p=0.43\\\\ H_a:p\neq0.43

Confidence interval for population proportion is given by :-

\hat{p}\pm z_c\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}} , where

n= sample size

\hat{p}= sample proportion

and z_c is the two-tailed z-value for confidence level (c).

As per given ,

Sample size of parents : n= 1085

Number of parents indicated that they were satisfied= 466

Sample proportion :  \hat{p}=\dfrac{466}{1085}\approx0.429

Critical value for 90​% confidence interval : z_c=1.645  ( by z-value table)

Now, the  90​% confidence interval :

0.429\pm (1.645)\sqrt{\dfrac{0.429(1-0.429)}{1085}}\\\\=0.429\pm 0.0247\\\\=(0.429-0.0247,\ 0.429+0.0247)\\\\=(0.4043,\ 0.4537)

Thus , the 90​% confidence interval: (0.4043, 0.4537).

Since 0.43 lies in 90​% confidence interval , it means we do not  have enough evidence to reject the null hypothesis .

i.e. We are have no evidence that parents' attitudes toward the quality of education have changed.

3 0
3 years ago
Find the area of the shape shown below.
11111nata11111 [884]

Answer:

The area is 31.5

Step-by-step explanation:

first you find the area of the rectangle (l x w) = 21

next you find the area of the triangle (b x h x 1/2) = 10.5

then you add the two areas together = 31.5

good luck with your khan academies :)

4 0
3 years ago
How to simplify this expression
jekas [21]
I think you have to find the value of x and y before u can simplify it.
3 0
3 years ago
20 points brainliest!!!!
maksim [4K]

Answer:

c i think

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
A large company claims that the average age of their employees is 32 years, with a standard deviation of 4 years. The average ag
4vir4ik [10]

Given that average age of employees of a large company is Normal

X - average age of employees

X:N(32,4)

The average age of employees in sales dept is 27 years.

Prob that an employee, chosen at random, will be younger than 27 years.

= P(X<27)

Let us convert x into Z

Z = (x-32)/4 = -5/4 = -1.25

Reqd prob = P(Z<-1.25) =0.5-0.3925

= 0.1075

Hence 10.56% is the correct answer.

3 0
3 years ago
Read 2 more answers
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