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2 years ago

I have no clue how to answer this

Mathematics

1 answer:

lina2011 [118]2 years ago

5 0

Answer:
ppemdasppemdaspemdas
Step-by-step explanation:
20istheanswer20istheanswer20istheanswer20istheanswer20istheanswer20istheanswer20istheanswer20istheanswer20istheanswer

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What is 8 over 18 written as decimal

zvonat [6]

Its <span>0.444444444. hope this helps you</span>

8 0

3 years ago

Read 2 more answers

A random sample of computer startup times has a sample mean of x¯=37.2 seconds, with a sample standard deviation of s=6.2 second

juin [17]

Answer:

95% of the data lies between 24.8 and 49.6

Step-by-step explanation:

* Lets revise the empirical rule

- The Empirical Rule states that almost all data lies within 3

standard deviations of the mean for a normal distribution.

- 68% of the data falls within one standard deviation.

- 95% of the data lies within two standard deviations.

- 99.7% of the data lies Within three standard deviations

- The empirical rule shows that

# 68% falls within the first standard deviation (µ ± σ)

# 95% within the first two standard deviations (µ ± 2σ)

# 99.7% within the first three standard deviations (µ ± 3σ).

* Lets solve the problem

- A random sample of computer startup times has a sample mean of

μ = 37.2 seconds

∴ μ = 37.2

- With a sample standard deviation of σ = 6.2 seconds

∴ σ = 6.2

- We need to find between what two times are approximately 95%

of the data

∵ 95% of the data lies within two standard deviations

∵ Two standard deviations (µ ± 2σ) are:

∵ (37.2 - 2 × 6.2) = 24.8

∵ (37.2 + 2 × 6.2) = 49.6

∴ 95% of the data lies between 24.8 and 49.6

* <em>95% of the data lies between 24.8 and 49.6</em>

3 0

3 years ago

In a study of cell phone usage and brain hemispheric dominance, an Internet survey was e-mailed to 6965 subjects randomly sele

vladimir1956 [14]

The hypothesis test shows that we reject the null hypothesis and there is sufficient evidence to support the claim that the return rate is less than 20%

<h3>What is the claim that the return rate is less than 20% by using a statistical hypothesis method?</h3>

The claim that the return rate is less than 20% is p < 0.2. From the given information, we can compute our null hypothesis and alternative hypothesis as:

$\mathbf{H_o :p =0.2}$

$\mathbf{H_i:p < 0.2}$

Given that:
Sample size (n) = 6965

Sample proportion $\mathbf{\hat p = \dfrac{x}{n} = \dfrac{1302}{6965} \sim0.1869}$

The test statistics for this data can be computed as:

$\mathbf{z = \dfrac{\hat p - p}{\sqrt{\dfrac{p(1-p)}{n}}}}$

$\mathbf{z = \dfrac{0.1869 -0.2}{\sqrt{\dfrac{0.2(1-0.2)}{6965}}}}$

$\mathbf{z = \dfrac{-0.0131}{0.0047929}}$

z = -2.73

From the hypothesis testing, since the p < alternative hypothesis, then our test is a left-tailed test(one-tailed.

Hence, the p-value for the test statistics can be computed as:

P-value = P(Z ≤ z)

P-value = P(Z ≤ - 2.73)

By using the Excel function =NORMDIST (-2.73)

P-value = 0.00317

P-value ≅ 0.003

Therefore, we can conclude that since P-value is less than the significance level at ∝ = 0.01, we reject the null hypothesis and there is sufficient evidence to support the claim that the return rate is less than 20%

Learn more about hypothesis testing here:

brainly.com/question/15980493

#SPJ1

3 0

2 years ago

12+16(5×10)÷20-2=<br><br>What is the answer ?

mrs_skeptik [129]

$\implies {\blue {\boxed {\boxed {\purple {\sf {50}}}}}}$