3 years ago

Find the value of x in the questions?

Mathematics

1 answer:

tino4ka555 [31]3 years ago

5 0

Answer

Step-by-step explanation:

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A Simple random sample of 100 8th graders at a large suburban middle school indicated that 84% of them are involved with some ty

Setler [38]

Answer: a) (0.755, 0.925)

Step-by-step explanation:

Let p be the population proportion of 8th graders are involved with some type of after school activity.

As per given , we have

n= 100

sample proportion: $\hat{p}=0.84$

Significance level : $\alpha= 1-0.98=0.02$

Critical z-value : $z_{\alpha/2}=2.33$ (using z-value table)

Then, the 98% confidence interval that estimates the proportion of them that are involved in an after school activity will be :-

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

i.e. $0.84\pm (2.33)\sqrt{\dfrac{0.84(1-0.84)}{100}}$

i.e. $\approx0.84\pm 0.085$

i.e. $(0.84- 0.085,\ 0.84+ 0.085)=(0.755,\ 0.925)$

Hence, the 98% confidence interval that estimates the proportion of them that are involved in an after school activity : a) (0.755, 0.925)

3 0

3 years ago

(6 + 4(-12) = i need help on this one too..

OlgaM077 [116]

Answer:

-42

Step-by-step explanation:

3 0

2 years ago

Plzzzz help mehh its scientific notation and im putting alot o point for it

s344n2d4d5 [400]

$(7.2\cdot10^7)^2=7.2^2\cdot(10^7)^2=51.84\cdot10^{14}=\boxed{5.184\cdot10^{15}}=\\
\boxed{5,184,000,000,000,000}$

5 0

3 years ago

A customer enters a store and purchases a pair of slippers for 5 dollars. He pays with a 20 dollar bill. The merchant asks the g

Finger [1]

Answer:

he loses 5 dollars

Step-by-step explanation:

5+20=25

25-$20=5

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3 years ago

Which figures below are congruent? 1 and 2 2 and 3 1 and 3 2 and 4

zvonat [6]

Answer:

1 and 3

Step-by-step explanation:

since they both are equal shape with equal sizes.

4 0

3 years ago