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2 years ago

13

WILL GIVE BRAINLEIST EASY Determine whenther the statement below is always,sometimes,or never true. Justify your reasoning. The

expressions x-3 and y-3 represent the same value.

1 answer:

Alex_Xolod [135]2 years ago

6 0

Answer:

sometimes

Step-by-step explanation:

it really depends on what X and Y stand for if they mean the same thing then of course but in the more likely case they would be totally different and would not be equal to each other

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The amount of time the husband and the wife spend on house work is measured for 15 women and their 15 husbands. For the wives th

dolphi86 [110]

Answer:

The value of the test statistic is z = -0.877.

Step-by-step explanation:

Testing the difference in mean time spent on housework between husbands and wives.

At the null hypothesis, we test if there is no difference, that is, the subtraction of the means is 0:

$H_0: \mu_H - \mu_W = 0$

At the alternate hypothesis, we test if there is a difference, that is, the subtraction of the means is different from 0.

$H_1: \mu_H - \mu_W \neq 0$

The test statistic is:

$z = \frac{X - \mu}{s}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis, and s is the standard error.

0 is tested at the null hypothesis:

This means that $\mu = 0$

For the wives the mean was 7 hours/week and for the husbands the mean was 4.5 hours/week. The standard deviation of the differences in time spent on house work was 2.85.

This means that $X = 4.5 - 7 = -2.5, s = 2.85$

What is the value of the test statistic for testing the difference in mean time spent on housework between husbands and wives?

$z = \frac{X - \mu}{s}$

$z = \frac{-2.5 - 0}{2.85}$

$z = -0.877$

The value of the test statistic is z = -0.877.

4 0

3 years ago

If 1 sec = 5 dots how many dots will there be in 20 secs

Natali5045456 [20]

5*20=100, the answer would be 100 dots

4 0

3 years ago

In two hours Holden completed 3/4 of his race how long will it take Holden to complete the entire race?

vivado [14]

Answer:

$\frac{1}{4}$ = 50 Minutes

Whole Race Time : 2 Hour and 50 Minutes

Step-by-step explanation:

so 2 Hour = $\frac{3}{4}$ Race completed

we need to find what 1/4 Race = x Hours

so 200 divided by 4 because $\frac{3}{4}$ Race is done.

we need to find how long to finish the whole race also known as $\frac{4}{4}$ .

200 divided by 4 = 50

so Holden still need 50 Minutes to finish the race.

8 0

2 years ago

97823843221623882623602794632621621738987345381237787733247697818473621883466325342536234347642375362374564357343525234766244353

elixir [45]

The answer is 6 :), I hope this helps <33!3&9/&

5 0

3 years ago

Read 2 more answers

Find the area of this irregular polygon.

Rainbow [258]

Answer:

970m^{2}

Step-by-step explanation:

This polygon can be divided in two figures: one is a triangle, an the other one is a square.

We'll begin calculating the triangle's area, using the following formula:

$At= \frac{b.h}{2}$

Where:

$H= height = 30 m$

$B = 9 m + 9 m + 20 m = 38 m$

As you can see, I added both sides of the triangle that measure 9 m and also the lenght of the square that measures 20 m! This added up is what the base of the triangle measures on total.

$At= \frac{38 m .30 m}{2}$

$At= \frac{1140 m^{2} }{2}$

$At= 570 m^{2}$

Now we are going to calculate the square's area, that is much more simple:

$As= L^{2}$

Where:

$L=20 m$

$As= (20 m)^{2} = 400m^{2}$

To know the whole figure's area, we add up both areas:

$A = At+As = 570m^{2} +400m^{2}=970m^{2}$

3 0

3 years ago