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1 year ago

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Ico wanted to determine the number of students in his school who buy school lunch. He walked around the cafeteria one lunch peri

od looking to see whether every fifth person in the cafeteria purchased lunch or brought their own.
Which method did he use to collect his data?

1 answer:

CaHeK987 [17]1 year ago

5 0

D. Observation study

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Density is mass divided by volume. Find the density of an aluminum block with a mass of 35 grams and a volume of 14 cm3?.

jenyasd209 [6]

Density is Mass divide by Volume

D = m/v

D = 35g / 14cm3

D = 2.5 cm3

Answer:

B) 2.5cm3

{Hope that helps}

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2 years ago

What number is between 2 and 7 is less than 100 but larger than 50 the product of three different prime numbers?

alukav5142 [94]

............... it is 70

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3 years ago

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PTC is a substance that has a strong bitter taste for some people and is tasteless for others. The ability to taste PTC is inher

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Answer:

a) $n=\frac{0.76(1-0.76)}{(\frac{0.01}{1.64})^2}=4905.83$

And rounded up we have that n=4906

b) For this case since we don't have prior info we need to use as estimatro for the proportion $\hat p =0.5$

$n=\frac{0.5(1-0.5)}{(\frac{0.01}{1.64})^2}=6724$

And rounded up we have that n=6724

Step-by-step explanation:

We need to remember that the confidence interval for the true proportion is given by :

$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$

Part a

The estimated proportion for this case is $\hat p =0.76$

Our interval is at 90% of confidence, and the significance level is given by $\alpha=1-0.90=0.1$ and $\alpha/2 =0.05$ . The critical values for this case are:

$z_{\alpha/2}=-1.64, t_{1-\alpha/2}=1.64$

The margin of error for the proportion interval is given by this formula:

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

The margin of error desired is given $ME =\pm 0.01$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

Replacing we got:

$n=\frac{0.76(1-0.76)}{(\frac{0.01}{1.64})^2}=4905.83$

And rounded up we have that n=4906

Part b

For this case since we don't have prior info we need to use as estimatro for the proportion $\hat p =0.5$

$n=\frac{0.5(1-0.5)}{(\frac{0.01}{1.64})^2}=6724$

And rounded up we have that n=6724

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3 years ago

A grocery store recently sold 12 cans of soup, 6 of which were black bean soup. Based on experimental probability, how many of t

gladu [14]

Answer:

10

Step-by-step explanation:

P(black bean soup) = cans of black bean / total = 6/12 =1/2

out of the next 20

20 *P(black bean)

20 * 1/2 = 10

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3 years ago

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Elsa drove 603 miles in9 hours at the same rate how many miles would she drive in 7 hours

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Answer:

469 miles

Step-by-step explanation:

divide 603 by 9 which is 67, multiply 7 into 67 and the answer into that is 469

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2 years ago