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3 years ago

7

the heights (in inches) OF 8 students are 50,53,52,68,54,49,55, and 51. What Is the mean height if the outlier Is removed from t

he data ?

1 answer:

dsp733 years ago

6 0

The mean is 52 inches.

49, 50, 51, 52, 53, 54, 55 add the numbers all together then divide 364 by 7 = 52

you do not include the outier

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What is 4 tens and 6 tenths as a decimal

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Answer 4.6

Step-by-step explanation:

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3 years ago

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A researcher expects a treatment to produce an increase in the population mean. The treatment is evaluated using a one tailed hy

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Answer:

A) The researcher should reject the null hypothesis with a = .05 but not with a = .01.

Step-by-step explanation:

State the null and alternative hypotheses to be tested

On this case we can assume that the researcher conduct a one right tailed test hypothesis like on this way:

Null hypothesis: $\mu \leq \mu_o$

Alternative hypothesis: $\mu > \mu_o$

The statistic for this case is given by:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

On this case we have the value for z score given z =+1.85

It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.

The significance level provided $\alpha=0.05,0.01$ . The next step would be calculate the p value for this test.

Since is a one right tail test the p value would be:

$p_v =P(z>1.85)=1-P(Z$

If we compare the p value obtained and the significance level given $\alpha=0.05,0.01$ we can take a decision:

A) The researcher should reject the null hypothesis with a = .05 but not with a = .01.

YES, since the p value it's higher than the significance level of 0.01 so we FAIL to reject the null hypothesis at this significance level. And for the significance level 0.05 we have that $p_v$ and we can reject the null hypothesis.

B) The researcher should reject the null hypothesis with either a = .05 or a = .01.

No since the p value it's higher than the significance level of 0.01 so we FAIL to reject the null hypothesis at this significance level

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No, for the significance level of 0.05 we reject the null hypothesis since $p_v$

D) This cannot be answered without additional information.

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4 years ago

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timofeeve [1]

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4 years ago

Isaac shoveled 9 of his neighbors' driveways after a snow storm. He charged $25 for a short driveway and $45 for a long driveway

e-lub [12.9K]

Answer:

y($) = 405- 20x

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4 years ago

A sound wave travels through iron at a rate of 5120\,\dfrac{\text{m}}{\text{s}}5120 s m 5120, start fraction, start text, m, e

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Answer:

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Step-by-step explanation:

It is given that a sound wave travels through iron at a rate of 5120 m/s.

We know that

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Therefore, the sound wave travels through iron at a rate of 18432 km/h.

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3 years ago