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3 years ago

Solve: e^2x+5= 4 (for those who want the answer to this!)

Mathematics

1 answer:

olga2289 [7]3 years ago

3 0

Answer:

Step-by-step explanation:

With the way it is written, there are no values of <em>x</em><em> </em>that make the equation true.

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tekilochka [14]

The answer would be a^9 (a to the ninth power) because you would add the exponents.

5 0

3 years ago

A 20 packet box of detergent sells for $5.49. What is the unit rate

jolli1 [7]

Answer:$0.27

Step-by-step explanation:

20=$5.49

1=20/5.49

1=$0.2745

6 0

3 years ago

Dullco Manufacturing claims that its alkaline batteries last at least 40 hours on average in a certain type of portable CD playe

Gennadij [26K]

Answer:

$p_v =P(t_{17}$

If we compare the p value and the significance level given $\alpha=0.05$ we see that $p_v>\alpha$ so we can conclude that we have enough evidence to FAIL to reject the null hypothesis.

The best option for this case would be:

We would switch to α = .01 for a more powerful test.

Step-by-step explanation:

Previous concepts and data given

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X=37.8$ represent the sample mean

$s=5.4$ represent the sample standard deviation

n=18 represent the sample selected

$\alpha=0.05$ significance level

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the mean is less than 40, the system of hypothesis would be:

Null hypothesis: $\mu \geq 40$

Alternative hypothesis: $\mu < 40$

If we analyze the size for the sample is < 30 and we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, 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:

$t=\frac{37.8-40}{\frac{5.4}{\sqrt{18}}}=-1.728$

P-value

First we need to calculate the degrees of freedom given by:

$df=n-1=18-1=17$

Since is a left tailed test the p value would be:

$p_v =P(t_{17}$

Conclusion

If we compare the p value and the significance level given $\alpha=0.05$ we see that $p_v>\alpha$ so we can conclude that we have enough evidence to FAIL to reject the null hypothesis.

The best option for this case would be:

We would switch to α = .01 for a more powerful test.

Since the p values is just a little higher than th significance level 0.051>0.05 but the values are two close. If we change the value of the significance by 0.01, we have that 0.051>0.01 and it's a more powerful test.

4 0

3 years ago

There are 16 marbles in a bowl: 3 are red, 6 are black, and 7 are green, Jimmy draws

Mila [183]

2383x28393=18283 that is the correct

8 0

3 years ago

A recipe includes 8 cups of flour and 2/3 third cups of sugar right the ratio of the amount of flour to the amount of sugar as a

Art [367]

Its 8:2/3, we can write it as $\frac{8}{ \frac{2}{3} } =8 *\frac{3}{2} = \frac{8*3}{2} = \frac{24}{2}= \frac{12}{1}$
Now we can back to 12:1 - its the result

5 0

3 years ago