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3 years ago

Which statement must be true about line TU?

Mathematics

1 answer:

Kitty [74]3 years ago

7 0

Answer:

wer: The true statement is 'Line TU is parallel to line RS'. Explanation: Since, we know that if a line is perpendicular to two different lines then these two different lines must be parallel to each other. Here, it is given that WV is perpendicular to both lines RS and TU. Therefore, RS must be parallel to TU.

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True or false<br> The larger the sample size the more accurate the sample is to the population.

stiv31 [10]

Answer:

True

Step-by-step explanation:

it makes sense

~Plz tap the crown~

~Thank you~

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3 years ago

Read 2 more answers

How do I graph <br> {y=x+5 <br> {y= -x - 3

Lera25 [3.4K]

I hope this helps and gives you the right answer.

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3 years ago

A study was conducted to determine whether the mean braking distance of four-cylinder cars is greater than the mean braking dist

ankoles [38]

Answer:

a) t-test for two independent samples

b) For this case we have two different samples and both are less than 30 and we don't have any info about the populationd deviation's. So for this case the most appropiate test is the t-tes for two independent samples

Step-by-step explanation:

The independent t-test, is known as two sample t-test or independent-samples t-test, is an statistical test used to " determines whether there is a statistically significant difference between the means in two unrelated groups"

The system of hypothesis could be on this case like this:

Null hypothesis: $\mu_1 = \mu_2$

Alternative hypothesis: $\mu_1 \neq \mu_2$

Or equivalently:

Null hypothesis: $\mu_1 - \mu_2 = 0$

Alternative hypothesis: $\mu_1 -\mu_2 \neq 0$

The statistic to check the hypothesis is given by:

$t=\frac{(\bar X_1 -\bar X_2)-(0)}{\sqrt{\frac{s^2_1}{n_1}+\frac{s^2_2}{n_2}}}$

And this statistic follows a t distribution with degrees of freedom $df=n_1 +n_2 -2$

We can check the hypothesis using the p value method or the critical approach, but we need to have a significance level.

Part a

i) t-test for two independent samples

Part b

Explain the rationale for your selection in (a). Specifically, why would this be the appropriate statistical approach?

For this case we have two different samples and both are less than 30 and we don't have any info about the populationd deviation's. So for this case the most appropiate test is the t-test for two independent samples

6 0

3 years ago

MATEMATICAS II

ASHA 777 [7]

Wish I could help but would have to go with answer 25

5 0

3 years ago

Roll two fair dice. Each die has six faces. A. Let A be the event that either a 3 or 4 is rolled first followed by an odd number

zhenek [66]

Answer:

A. 0.16

B. 0.58

C. No

D. Dependent

Step-by-step explanation:

The sampling space has 36 outcomes.

The event A has 6 outcomes (3,1), (3,3), (3,5), (4,1), (4,3),(4,5)

So P(A)= 6/36 = 0.16

The table in the picture shows the 15 outcomes that are not allowed, so there are 36-15 = 21 possible outcomes for B and its probability is 21/36 = 0.58

Are A and B mutually exclusive events?

No since their intersection is not empty, for example (3,1) belongs to both A and B

In order for A and B to be independent, it must happen that

P(A∩B)=P(A)P(B)

A∩B={(3,1),(3,3),(4,1)} so P(A∩B) = 3/36

whereas

P(A)P(B) = (6/36)(21/36) = (1/6)(7/12)=7/72

So A and B are not independent.

7 0

4 years ago