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3 years ago

The units for square centimeters are written as

2 answers:

7 0

<span>square centimeter. a unit of area measurement equal to a square measuring one centimeter on each side. , sq. cm. The intensity of a magnetic flux is expressed by the number of magnetic lines of force in a square centimeter or square inch.</span>

zhannawk [14.2K]3 years ago

5 0

Answer:cm^2

Sq.cm

Step-by-step explanation:

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An article in Fire Technology describes the investigation of two different foam expanding agents that can be used in the nozzles

kvv77 [185]

Answer:

a) There is no evidence to support the claim that there is no difference in mean foam expansion of these two agents.

b) P=0

c) 90% CI

$-3.2406\leq \mu_1-\mu_2 \leq -2.2614$

This CI tells us that there is a 90% confidence that the real value of the difference between the means is between this two values. We see that both are negative values, so the value 0 is left out of the interval.

That means we can be almost sure both means don't have the same value, confirming the results of the previous test.

Step-by-step explanation:

The null and alternative hypothesis are:

$H_0: \mu_1-\mu_2=0\\\\H_a: \mu_1-\mu_2\neq 0$

The significance level is 0.10 and it will be a two-tailed test.

The difference of the sample means is:

$M_d=M_1-M_2=4.340-7.091=-2.751$

As the sample size is equal for both samples, the estimated standard error of the difference between means is calculated as:

$s_M_d=\sqrt{\frac{s_1^2+s_2^2}{N}}= \sqrt{\frac{0.508^2+0.430^2}{5}}=\sqrt{\frac{0.442964}{5} }= \sqrt{0.0886}=0.2976$

Then, the statistic z is:

$z=\frac{M_d-(\mu_1-\mu_2)}{s_M_d}=\frac{-2.751-0}{0.2976}=-9.24\\\\P(|z|>9.24)=0$

The P-value (P=0) is much lower than the significance level, so the null hypothesis is rejected. The means are different.

For a 90% confidence interval for the difference of the means, we use a z=1.645.

Then the confidence interval is defined as:

$M_d-z*s_M_d\leq \mu_1-\mu_2 \leq M_d-z*s_M_d\\\\-2.751-1.645*0.2976\leq \mu_1-\mu_2 \leq -2.751+1.645*0.2976\\\\-3.2406\leq \mu_1-\mu_2 \leq -2.2614$

That means we can be almost sure both means don't have the same value.

5 0

3 years ago

Factor. x^2 - 11x + 30 delta math

4vir4ik [10]

Answer:

(x-5)(x-6)

Step-by-step explanation:

-6-5=-11

-6 times -5=30

so...

(x-5)(x-6) and -5 and -6 are the factors.

4 0

3 years ago

Suppose you drive for 60 miles at 60 miles per hour, then for 60 miles at 30 miles per hour. in miles per hour what is your aver

GrogVix [38]

You drove for half the time at 60mph and the other half the time at 30mph.

To find your average speed, we add 60 and 30 then divide them by two (because you drove at 2 different speeds). 60+30 = 90 and 90/2 = 45 so 45 miles per hour is your average speed.

Note: Velocity implies a direction to the force and there is no direction in this question, just speed. Without direction we cannot use velocity, only speed.

3 0

3 years ago

An Uber fare in Columbus is $3.50 for the first ½ mile and additional mileage charged at a rate of $0.30 for each additional 0.1

Verizon [17]

Answer:

$\frac{11}{3}$ miles