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3 years ago

PLEASE HELP I DON'T KNOW THIS IT IS SO HARD?? I will give brainliest to the CORRECT ANSWER :(

Mathematics

2 answers:

rodikova [14]3 years ago

8 0

D is your answer good sir

GaryK [48]3 years ago

4 0

Answer:

Step-by-step explanation:

Hey There!

So the first thing we want to do is find the volume for a rectangular prism

$v=hxlxw$

volume = height x length x width

so to find the volume of this prism we do

$1\frac{1}{2} x\frac{1}{2} x2$

If you plug that into a calculator you get that the volume of the prism is 1 1/2

Now we want to find how many half unit cubes there are

It says that there are 8 half unit cubes in every unit cube

So to find the amount of half cubes we multiply 8 by 1 1/2

$1\frac{1}{2} x8$ =12

So we can conclude that the answer to this problem is D

<em>The1AndOnlyMarkus</em>

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(a)

H0: Population mean = 8.46

H1: Population mean is not equal to 8.46

The test statistic (t) is given by the following expression -

${t=\frac{\overline{x}-\mu_0}{s/\sqrt{n}}}$

We have calculated the sample mean (8.421) and sample standard deviation (0.0461). Therefore, the test statistic (t) will be -

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The left-sided critical value from t-distribution (two-tailed) is -2.01. Thus the test statistic falls in the rejection region and we reject the null hypothesis at 95% confidence level and conclude that the population mean is different from 8.46 inches.

(b)

There are the following four assumptions for a single sample t-test.

The observations are in ratio scale.

The observations have been taken in such a manner that every single observation is independent and uncorrelated from the others.

There should not be any significant outliers in the sample observations.

The sample data should be approximately normal.

(c)

The first assumption is true as the data is in inches. The second assumption cannot be tested now. It will depend upon the situation and study design which we assume as correct in this case. The third assumption is checked by plotting a box plot and finding the outliers. The final assumption can be checked using the Anderson-Darling normality test.

Kindly check the graphical table in the attached images below.

(d)

The data is normal (the p-value of Anderson-Darling test in > 0.05). However, two points in the Box plot are outliers though not grossly different from the entire sample data set. So, we conclude that the assumptions are valid in this case for conducting the t-test.