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3 years ago

The quotient of a number x and -1.5 = 21

Mathematics

2 answers:

Arada [10]3 years ago

5 0

X × - 1.5 = 21 ,so therefore x =21 ÷ -1.5 = -14

Lapatulllka [165]3 years ago

4 0

Should be... x ÷ -1.5 = 21

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A survey reported in Time magazine included the question ‘‘Do you favor a federal law requiring a day waiting period to purchase

il63 [147K]

Answer:

The 90% confidence interval for the difference between proportions is (-0.260, -0.165).

Step-by-step explanation:

The question is incomplete. The complete question is:

"A survey reported in Time magazine included the question ‘‘Do you favor a federal law requiring a 15 day waiting period to purchase a gun?” Results from a random sample of US citizens showed that 318 of the 520 men who were surveyed supported this proposed law while 379 of the 460 women sampled said ‘‘yes”. Use this information to find a 90% confidence interval for the difference in the two proportions, pm - pw. Subscript pm is the proportion of men who support the proposed law and pw is the proportion of women who support the proposed law. (Round answers to 3 decimal places.)"

We want to calculate the bounds of a 90% confidence interval.

For a 90% CI, the critical value for z is z=1.645.

The sample of men, of size nm=-0.26 has a proportion of pm=0.612.

$p_m=X_m/n_m=318/520=0.612$

The sample 2, of size nw= has a proportion of pw=0.824.

$p_w=X_w/n_w=379/460=0.824$

The difference between proportions is (pm-pw)=-0.212.

$p_d=p_m-p_w=0.612-0.824=-0.212$

The pooled proportion, needed to calculate the standard error, is:

$p=\dfrac{X_m+X_w}{n_m+n_w}=\dfrac{318+379}{520+460}=\dfrac{697}{980}=0.711$

The estimated standard error of the difference between means is computed using the formula:

$s_{pm-pw}=\sqrt{\dfrac{p(1-p)}{n_m}+\dfrac{p(1-p)}{n_w}}=\sqrt{\dfrac{0.711*0.289}{520}+\dfrac{0.711*0.289}{460}}\\\\\\s_{pm-pw}=\sqrt{0.00039+0.00045}=\sqrt{0.001}=0.029$

Then, the margin of error is:

$MOE=z \cdot s_{pm-pw}=1.645\cdot 0.029=0.0477$

Then, the lower and upper bounds of the confidence interval are:

$LL=(p_1-p_2)-z\cdot s_{p1-p2} = -0.212-0.0477=-0.260\\\\UL=(p_1-p_2)+z\cdot s_{p1-p2}= -0.212+0.0477=-0.165$

The 90% confidence interval for the difference between proportions is (-0.260, -0.165).

6 0

3 years ago

F(x) = –3x2 – 7x Find f(7)

Dominik [7]

Answer:

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers

Which of the following statements are true? Select all that apply.

nlexa [21]

1. true
example:
2+3=3+2
5=5

2. true
example:
3*4=4*3
12=12

3. false
example:
6-3=3-6
3≠-3

4. true
example:
(4 + 3) + 2= 4 + (3 + 2)
7 + 2 = 4 + 5
9 = 9

5. false
example:
(9 - 6) - 3 = 9 - (6 - 3)
3 - 3 = 9 - 3
0 ≠ 6

6. true
example:
2(3+4)= 2*3+2*4
2 * 7 = 6 + 8
14 = 14

6 0

3 years ago

Write out the sample space for the given experiment. Use the letter R to indicate red, G to indicate green, and B to indicate bl

Vilka [71]

Answer:

Answer for the question:

Write out the sample space for the given experiment. Use the letter R to indicate red, G to indicate green, and B to indicate blue. A die shows 33 different colors on it. Give the sample space for the next 22 rolls.

is given in the attachment.

Step-by-step explanation:

Download pdf

3 0

3 years ago

The distance 13,860 feet is equal to 2 5/8 write this as a decimal please

Ann [662]

Answer: 2.625

Step-by-step explanation:

All you have to do is divide 5 by 8 which gives you .625 and then you put the 2 in front of the decimal amd you get your answer.

8 0

3 years ago