All categories

3 years ago

Can someone help me?

Mathematics

1 answer:

Marizza181 [45]3 years ago

7 0

Fesses sjsvsisjosksjssksvdidhidhduudbdidhdjdidi answer is 40

You might be interested in

Suppose a consumer group suspects that the proportion of households that have three cell phones NOT known to be 30%. A cell phon

leva [86]

Answer:

We conclude that the actual percentage of households is equal to 30%.

Step-by-step explanation:

We are given that a consumer group suspects that the proportion of households that have three cell phones NOT known to be 30%.

Their marketing people survey 150 households with the result that 43 of the households have three cell phones.

Let p = proportion of households that have three cell phones NOT known.

So, Null Hypothesis, $H_0$ : p = 30% {means that the actual percentage of households is equal to 30%}

Alternate Hypothesis, $H_A$ : p $\neq$ 30% {means that the actual percentage of households different from 30%}

The test statistics that would be used here One-sample z-test for proportions;

T.S. = $\frac{\hat p-p}{\sqrt{\frac{p(1-p)}{n} } }$ ~ N(0,1)

where, $\hat p$ = sample proportion of households having three cell phones = $\frac{43}{150}$ = 0.29

n = sample of households = 150

So, the test statistics = $\frac{0.29-0.30}{\sqrt{\frac{0.30(1-0.30)}{150} } }$

= -0.27

The value of z test statistic is -0.27.

Also, P-value of the test statistics is given by;

P-value = P(Z < -0.27) = 1 - P(Z $\leq$ 0.27)

= 1 - 0.6064 = 0.3936

Now, at 1% significance level the z table gives critical value of -2.58 and 2.58 for two-tailed test.

Since our test statistic lies within the range of critical values of z, so we have insufficient evidence to reject our null hypothesis as it will not fall in the rejection region due to which we fail to reject our null hypothesis.

Therefore, we conclude that the actual percentage of households is equal to 30%.

4 0

3 years ago

Given A(3, 4), B(4, 3) and C(2, 1), what are the coordinates of C', the image of C under a rotation of 90 degrees about the orig

Aleks [24]

Given:

The coordinates of the points A, B and C are (3,4), (4,3) and (2,1)

The points are rotated 90° about the origin.

We need to determine the coordinates of the point C'.

Coordinates of the point C':

The general rule to rotate the point 90° about the origin is given by

$(x, y) \Rightarrow(-y, x)$

Substituting the coordinates of the point C in the above formula, we get;

$(2, 1) \Rightarrow(-1, 2)$

Therefore, the coordinates of the point C' is (-1,2)

5 0

3 years ago

Help needed ASAP will give brainliest and 5 STARS RATE

Vera_Pavlovna [14]

Answer:

the first one

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

SOMEONE PLEASE HELP ME ASAP PLEASE!!!

nadezda [96]

Answer:

$y=-4x+5$

Step-by-step explanation:

Parallel lines have the same slope, but different y-intecpets. They are lines that travel in the same directions but never intercept.

6 0

2 years ago

Read 2 more answers

Danny poured 78 l of water into containers xy and z. the ratio of the volume of water in container x to the volume of water in c

Paladinen [302]

The ratio of x:y:z = 20:8:11

Total unit = 20+8+11 = 39

Value of 1 unit ratio = 78/39 = 2

So, the water in container X, 20(2) = 40 liters

Your answer is 40 liters

7 0

3 years ago