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Ugo [173]
2 years ago
10

Below is the number of service calls a store received over a period of 87 days.

Mathematics
1 answer:
oksian1 [2.3K]2 years ago
4 0
Maybe D…………………………………….
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In 2011, a U.S. Census report determined that 71% of college students work. A researcher thinks this percentage has changed sinc
coldgirl [10]

Answer:

Note: The full question is attached as picture below

a) Hо : p = 0.71

Ha : p ≠ 0.71

<em>p </em>= x / n

<em>p </em>= 91/110

<em>p </em>= 0.83.

1 - Pо = 1 - 0.71 = 0.29.

b) Test statistic = z

= <em>p </em>- Pо / [√Pо * (1 - Pо ) / n]

= 0.83 - 0.71 / [√(0.71 * 0.29) / 110]

= 0.12 / 0.043265

= 2.77360453

Test statistic = 2.77

c) P-value

P(z > 2.77) = 2 * [1 - P(z < 2.77)] = 2 * 0.0028

P-value = 0.0056

∝ = 0.01

P-value < ∝

Reject the null hypothesis.  There is sufficient evidence to support the researchers claim at the 1% significance level.

6 0
3 years ago
If 40% of a number is 56, what was the original number?
oksian1 [2.3K]
40/100= 56/x 40x=100(56) 40x=5600 Divide both sides by 40 to get x alone. X=140
7 0
3 years ago
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Bill bought 2 cups of coffee for $3 each and 2 muffins for $3 each. he used this expression to calculate the total amount he spe
Ostrovityanka [42]
A) (2+2)times3 because you will have to distributive properties, 
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3 years ago
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Find the center and radius of the circle.<br> (x + 3)2 + (y + 4)2 =9
Tpy6a [65]

The general equation for any circle with its center at point (a, b) is

                 (x - a)² + (y - b)²  =  (radius)²

So the circle in the question is centered at (-3, -4), and its radius is  3 .

7 0
3 years ago
In the diagram given below, △DEF∼△DGH, Find q
Kruka [31]

Answer:

q=3

Step-by-step explanation:

7 0
3 years ago
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