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3 years ago

Please give me answers with work if possible!!!

Mathematics

2 answers:

snow_lady [41]3 years ago

7 0

1) 45 1/2 just multiply it together
2) 1/6 divide 1/2 by 3
3)1 1/4 subtract 3 3/4 by 2 1/2
4) 1 5/6 + 2 2/3 is 4 1/2

Lerok [7]3 years ago

6 0

#1) 6 1/2 x 7 =45 1/2
#2) 1/2 divided by 3 = 0.5
#3) 3 3/4 - 2 1/2 = 1.25

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A company surveyed 2400 men where 1248 of the men identified themselves as the primary grocery shopper in their household. a) E

polet [3.4K]

Answer:

a) With a confidence level of 98%, the percentage of all males who identify themselves as the primary grocery shopper are between 0.4962 and 0.5438.

b) The lower limit of the confidence interval is higher that 0.43, so if he conduct a hypothesis test, he will find that the data shows evidence to said that the fraction is higher than 43%.

c) $\alpha =1-0.98=0.02$

Step-by-step explanation:

If np' and n(1-p') are higher than 5, a confidence interval for the proportion is calculated as:

$p'-z_{\alpha/2}\sqrt{\frac{p'(1-p')}{n} }\leq p\leq p'+z_{\alpha/2}\sqrt{\frac{p'(1-p')}{n} }$

Where p' is the proportion of the sample, n is the size of the sample, p is the proportion of the population and $z_{\alpha/2}$ is the z-value that let a probability of $\alpha/2$ on the right tail.

Then, a 98% confidence interval for the percentage of all males who identify themselves as the primary grocery shopper can be calculated replacing p' by 0.52, n by 2400, $\alpha$ by 0.02 and $z_{\alpha/2}$ by 2.33

Where p' and $\alpha$ are calculated as:

$p' = \frac{1248}{2400}=0.52\\\alpha =1-0.98=0.02$

So, replacing the values we get:

$0.52-2.33\sqrt{\frac{0.52(1-0.52)}{2400} }\leq p\leq 0.52+2.33\sqrt{\frac{0.52(1-0.52)}{2400} }\\0.52-0.0238\leq p\leq 0.52+0.0238\\0.4962\leq p\leq 0.5438$

With a confidence level of 98%, the percentage of all males who identify themselves as the primary grocery shopper are between 0.4962 and 0.5438.

The lower limit of the confidence interval is higher that 0.43, so if he conduct a hypothesis test, he will find that the data shows evidence to said that the fraction is higher than 43%.

Finally, the level of significance is the probability to reject the null hypothesis given that the null hypothesis is true. It is also the complement of the level of confidence. So, if we create a 98% confidence interval, the level of confidence $1-\alpha$ is equal to 98%

It means the the level of significance $\alpha$ is:

$\alpha =1-0.98=0.02$

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3 years ago

Calculate the volume

Yakvenalex [24]

V = LXHXW
V = 12X20X8 = 1920

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3 years ago

The absolute value function, f(x) = |x + 2|, is shown.

Anit [1.1K]

Answer:

Incomplete question

Step-by-step explanation:

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3 years ago

HURRY HELP

Gelneren [198K]

<h3>Answer: Choice (a) $1,653.66</h3>

=====================================================

Work Shown:

Use the compound interest formula

A = P*(1+r/n)^(n*t)

A = 10000(1+0.039/1)^(1*4)

A = 11,653.65589441

A = 11,653.66

That's the amount of money Tammy will have at the end of 4 years.

Subtract off the principal from this value to get the interest.

interest = A - P

interest = 11,653.66 - 10,000

interest = 1,653.66

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3 years ago

You make a scale drawing of a tree using the scale 5 in. = 27 ft. if the tree is 67.5 ft. tall, how tall is the scale drawing?

evablogger [386]

You would get the equivalent amount to 5in = ?ft then divide that by 67.5

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3 years ago