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stealth61 [152]

3 years ago

14

In forming a confidence interval for μ1 - μ2, only two assumptions are required: independent samples and sample sizes of at leas

t 30.
a. True
b. False

1 answer:

AysviL [449]3 years ago

6 0

I’m not sure but I guess it’s false

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A boat on a river travels downstream between two points, 90 mi apart, in 1 h. The return trip against the current takes 2 1 2 h.

docker41 [41]

Answer:

A)63miles per hour.

B)27 miles per hour

Step-by-step explanation:

HERE IS THE COMPLETE QUESTION

boat on a river travels downstream between two points, 90 mi apart, in 1 h. The return trip against the current takes 2 1 2 h. What is the boat's speed (in still water)??b) How fast does the current in the river flow?

Let the speed of boat in still water = V(boat)

speed of current=V(current)

To calculate speed of boat downstream, we add speed of boat in still water and speed of current. This can be expressed as

[V(boat) +V(current)]

It was stated that it takes 1hour for the

boat to travels between two points of 90 mi apart downstream.

To calculate speed of boat against current, we will substact speed of current from speed of boat in still water. This can be expressed as

[V(boat) - V(current)]

and it was stated that it takes 2 1/2 for return trip against the Current

But we know but Speed= distance/time

Then if we input the stated values we have

V(boat) + V(current)]= 90/1 ---------eqn(1)

V(boat) - V(current) = 90/2.5----------eqn(2)

Adding the equations we have

V(boat) + V(current) + [V(boat) - V(current)]= 90/2.5 + 90/1

V(boat) + V(current) + V(boat) - V(current)]=90+36

2V(boat)= 126

V(boat)=63miles per hour.

Hence, Therefore, the speed of boat in still water is 63 miles per hour.

?b) How fast does the current in the river flow?

the speed of the current in the river, we can be calculated if we input V(boat)=63miles per hour. Into eqn(1)

V(boat) + V(current)]= 90/1

63+V(current)=90

V(current)= 27 miles per hour

Hence,Therefore, the speed of current is 27 miles per hour.

7 0

3 years ago

What is the answer to this?

Dmitry [639]

Answer:

(c) III

Step-by-step explanation:

If you simplify the equations and the left side is identical to the right side, then there are an infinite number of solutions: the equation is true for all values of x.

Another way to simplify the equation is to subtract the right side from both sides. If that simplifies to 0 = 0, then there are an infinite number of solutions.

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<h3>I. </h3>

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-4x -6 = -4x +2 . . . . no solutions (no value of x makes this true)

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<h3>II.</h3>

x +2 = 15x +10 +2x . . . . eliminate parentheses

x +2 = 17x +10 . . . . one solution (x=-1/2)

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<h3>III.</h3>

4 +6x = 6x +4 . . . . eliminate parentheses

6x +4 = 6x +4 . . . . infinite solutions

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<h3>IV.</h3>

6x +24 = 2x -4 . . . . eliminate parentheses; one solution (x=-7)

8 0

2 years ago

Three sides of a kite measure 8 inches, 10 inches, and 8 inches. What is the perimeter of the kite?

olganol [36]

Answer:

26

Step-by-step explanation:

8+10+8=26

3 0

3 years ago

HELLPPPPP ASAP IM TAKING A TEST PLSS <br> Match each line with the correct equation:

sertanlavr [38]

Answer:

Y=x-1 is line n

y=-2x+4 is line m

y=4 is line t

x=-4 is line p

Step-by-step explanation:

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3 years ago

Write a proof that shows how 45 and 4.5 have a factor of 10. and are similar.

Sidana [21]

Answer: 4.5 x 10 = 45

0.45 x 10 = 4.5

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3 years ago