Mathematics, 11.03.2020 00:07 mprjug6

The county health department has concerns about the chlorine level of 0.4% mg/mL at a local water park increasing to an unsafe level. The water department tests the hypothesis that the local water park's chlorine proportions have remained the same, and find a P-value of 0.005.
Provide an appropriate conclusion.

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Answer from: kingoc321

$p_v =P(t_{(n-1)}t_{calc})=0.005$

If we compare the p value and the significance level given assumed $\alpha=0.01$ we see that p_v so we can conclude that we have enough evidence to reject the null hypothesis, so we can conclude that the true mean is higher than 0.4 % mg/mL at any significance level higher than 0.5%

Step-by-step explanation:

Data given and notation

$\bar X$ represent the sample mean

represent the sample standard deviation

sample size

$\mu_o =0.4$ represent the value that we want to test

$\alpha$ represent the significance level for the hypothesis test.

t would represent the statistic (variable of interest)

p_v represent the p value for the test (variable of interest)

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the mean i higher than 0.4, the system of hypothesis would be:

Null hypothesis: $\mu \leq 0.4$

Alternative hypothesis: $\mu 60.4$

We assume that we don't know th population deviation to we need to apply a t test, and the statistic is given by:

$t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}$ (1)

t-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".

Calculate the statistic

We can replace in formula (1) the info given like this:

$t_{calc}$

P-value

The first step is calculate the degrees of freedom, on this case:

df=n-1

Since is a one side test the p value would be:

$p_v =P(t_{(n-1)}t_{calc})=0.005$

Conclusion

Answer from: Quest

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that $\frac{ab}{de}=\frac{bc}{ef}$ .

also, it is given that $\frac{ab}{de}=\frac{3}{4}$

so, from the options, we need that $\frac{bc}{ef}=\frac{3}{4}$ .

a. $\frac{bc}{ef}=\frac{6}{9}=\frac{2}{3}$

b. $\frac{bc}{ef}=\frac{4}{6}=\frac{2}{3}$

c. $\frac{bc}{ef}=\frac{8}{12}=\frac{2}{3}$

d. $\frac{bc}{ef}=\frac{12}{16}=\frac{3}{4}$

as, we can see that only option d gives the same ratio as $\frac{ab}{de}=\frac{3}{4}$ i.e. $\frac{bc}{ef}=\frac{3}{4}$ .

hence, the possible lengths are bc = 12 and ef = 16.

Answer from: Quest

first one because it can't have a fraction in it

step-by-step explanation:

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