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3 years ago

Which phrase describes the algebraic expression 52-2?

Mathematics

1 answer:

ser-zykov [4K]3 years ago

7 0

Answer:

Step-by-step explanation:

i took the test and got it right

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A study sampled 350 upperclassmen (Group 1) and 250 underclassmen (Group 2) at high schools around the city of Houston. The stud

iris [78.8K]

Answer:

$-0.048$

Do not reject $H_0:P_1-P_2=0$

Step-by-step explanation:

From the question we are told that

Sample size $n_1=350$

Sample size $n_2=250$

Sample proportion 1 $\hat P= \frac{25}{350} =>0.07$

Sample proportion 2 $\hat P= \frac{19}{250} =>0.076$

95% confidence interval

Generally for 95% confidence level

Level of significance

$\alpha = 1-0.95=>0.05$

$\alpha /2=\frac{0.05}{2} =>0.025$

Therefore

$Z_a_/_2=1.96$

Generally the equation for confidence interval between $P_1 - P_2$ is mathematically given as

$(\hat P_1-\hat P_2)\pm Z_a_/_2\sqrt{\frac{\hat P_1(1-\hat P_1)}{n_1}+\frac{\hat P_2(1-\hat P_2)}{n_2} }$

$(0.07-0.076)\pm 1.96\sqrt{\frac{0.07(1-0.07)}{350}+\frac{0.076(1-0.076)}{250} }$

$(0.07-0.076)\pm 1.96\sqrt{4.66896*10^-^4 }$

$(-0.006)\pm 0.042$

$(-0.006)- 0.042=>-0.048$

$(-0.006)+ 0.042=>0.036$

Therefore

Confidence interval is

$-0.048$

Conclusion

Given the confidence interval has zero

Therefore do not reject $H_0:P_1-P_2=0$

6 0

3 years ago

4. The reference angle for 190 is<br> A. 10°<br> B. 180°<br> C. -10°<br> D. 90°

Nookie1986 [14]

Answer: A

Step-by-step explanation: A reference angle is smallest possible angles that terminal side makes with the x- axis. Since 190 degrees is located i the 3rd quadrant we use the formula 190-180 to find the possible answer and in this case it is A, 10.

3 0

3 years ago

Select the proper for parentheses to speed up the addition for the expression 2+9+8+1

NeTakaya

(2+9)+(8+1)=
18. 9.
\. /
27

6 0

3 years ago

Read 2 more answers

The price of an item has risen to $276 today. Yesterday it was $115. Find the percentage increase.

Nezavi [6.7K]

Are you kidding me, bro? lol

276-115=131
131 divided by 276 = 0.47

0.47% increase

6 0

3 years ago

What transformation to the linear parent function, f(x) = x, gives the function g(x) = x + 8?

NeTakaya

Answer:

Shift 8 units up

Step-by-step explanation:

The given function is;

f(x)=x

and

g(x)=x+8

The function f(x) has its y-intercept at y=0.

The function g(x)=x+8 has its y-intercept at y=8

This implies that; the linear parent function f(x)=x is shifted up 8 units to obtain g(x)=x+8.

5 0

3 years ago