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3 years ago

Which statement is true

Mathematics

2 answers:

Alex3 years ago

4 0

Answer: The means are equal.

Good Luck!

Step-by-step explanation:

kolbaska11 [484]3 years ago

3 0

they're equal. the 4th one, i believe,

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A circular garden has a circumference of 138 yards. Lars is digging a straight line along a diameter of the garden at a rate of

PilotLPTM [1.2K]

Answer:

4 hours

Step-by-step explanation:

Circumference formula:

C = πd

Use the given value and find the diameter:

138 = 3.14d
r = 138/3.14
r = 43.94 ≈ 44 yards

Time required to dig across the garden:

44/11 = 4 hours

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3 years ago

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If the product of some number and 4 is increased by 121, the result is 7 times the number. find the number.

arlik [135]

It will be 40.3 approximately

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3 years ago

The volume of a cone is 50 pi cm cubed. What is the radius of the cone. Height=6cm

Viefleur [7K]

Answer:

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Step-by-step explanation:

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2 years ago

Altogether, Alicia has to drive 104 miles on the turnpike.

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2 years ago

A past survey of students taking a standardized test revealed that % of the students were planning on studying engineering in c

Angelina_Jolie [31]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The 95% confidence interval is $-0.00870$

Step-by-step explanation:

From the question we are told that

The first sample size is $n_1 = 1068000$

The first proportion $\r p_1 = 0.084$

The second sample size is $n_2 = 1476000$

The second proportion is $\r p_2 = 0.092$

Given that the confidence level is 95% then the level of significance is mathematically represented as

$\alpha = (100 - 95)\%$

$\alpha = 0.05$

From the normal distribution table we obtain the critical value of $\frac{ \alpha }{2}$ the value is

$Z_{\frac{\alpha }{2} } =z_c= 1.96$

Now using the formula from the question to construct the 95% confidence interval we have

$(\r p_1 - \r p_2 )- z_c \sqrt{ \frac{\r p_1 \r q_1 }{n_1} + \frac{\r p_2 \r q_2 }{n_2} }$

Here $\r q_1 = 1 - \r p_1$

=> $\r q_1 = 1 - 0.084$

=> $\r q = 0.916$

and

$\r q_2 = 1 - \r p_2$

=> $\r q_2 = 1 - 0.092$

=> $\r q_2 = 0.908$

$(0.084 - 0.092 )- (1.96)* \sqrt{ \frac{0.092* 0.916 }{1068000} + \frac{0.084* 0.908 }{1476000} }$

$-0.00870$

3 0

3 years ago