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ycow [4]
3 years ago
9

Please someone answer my questions please

Mathematics
2 answers:
navik [9.2K]3 years ago
8 0

Answer:

What is your question?

Step-by-step explanation:

ddd [48]3 years ago
3 0

Answer:

well, what is your question?

Step-by-step explanation:

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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
You have had your eye on an outfit at the mall for the last month. It costs $115.78. Yesterday it went on sale for 30% off. If y
Ksivusya [100]
The answer to your question is $81.05
6 0
3 years ago
Read 2 more answers
Jack is purchasing a stock that pays an annual dividend of $3.42 per share. If he purchases 400 shares for $53.18 per share, wha
sergij07 [2.7K]

Answer:

1368 dollars.

Step-by-step explanation:

given that Jack s purchasing a stock that pays an annual dividend of $3.42 per share

No of shares Jack purchased = 400

Price per share = 53.18$

Amount invested by Jack in shares = 400*53.18 =21272 dollars

Annual dividend = 3.42 per share

Total dividend = 400*3.42 = 1368

Annual income from dividends = 1368 $

7 0
3 years ago
If I have 50 pencils that cost $10 how much is each pencil and what's the formula
Crazy boy [7]
They are $0.2 each

10/50=.20
7 0
3 years ago
Due in 20 minutes!! please help
iris [78.8K]

Answer:

can

Step-by-step explanation: ;)

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3 years ago
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