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devlian [24]
3 years ago
11

In order to determine whether or not there is a significant difference between the mean hourly wages paid by two companies (of t

he same industry), the following data have been accumulated.
Company A

Company B

Sample size

80

60

Sample mean

$16.75

$16.25

Population standard deviation

$1.00

$.95

​

The test statistic is

a.

1.645.

b.

3.01.

c.

2.75.

d.

.098.
Mathematics
1 answer:
dybincka [34]3 years ago
8 0

Test statistic = (mean 1 - mean 2) / sqrt( dev1/n1 + dev2/n2)

Mean 1 = $16.75

mean2 = $16.25

dev1 = $1.00

dev2 = $0.90

n1 = 80

n2 = 60

Test stat = (16.75 - 16.25) / sqrt(1/80 + 0.95/60)

Test stat = 3.01

The answer is B. 3.01

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It’s would be B because the formula or reflection is y-axis is (-x,y) and x-axis (x,-y)
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3 years ago
-5x+35=40<br><br>what are the steps?​
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Answer:

Step-by-step explanation:

-5x + 35 = 40

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Divide -5 from both sides -5x / -5 = 5 / -5 =

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An equilateral ∆ has sides of length 16 cm. Find the length of an altitude.
inn [45]

The length of the altitude is 8\sqrt{3}

Explanation:

Let ABC be an equilateral triangle.

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Let AD be the altitude of the triangle.

We need to determine the length of an altitude.

Let AC = 16 cm and CD = 8 cm

Let us consider the right angled triangle ADC

Using the Pythagorean theorem, we have,

AC^2=AD^2+DC^2

Substituting the values, we get,

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 256=AD^2+64

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8\sqrt{3}=AD

The length of the altitude is 8\sqrt{3}

5 0
3 years ago
How do you find the average rate of change for f(x)=9-x^2 between two points: x=0 to x=3?
ICE Princess25 [194]

Answer:

The average rate of change is -3.

Step-by-step explanation:

We are given the function:

f(x)=9-x^2

And we want to find the average rate of change from <em>x </em>= 0 to <em>x </em>= 3.

In other words, we will compute the function at the two endpoints, and then find the slope of the line that crosses the two points.

For our first endpoint at <em>x</em> = 0, our function evaluates to:

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For our second endpoint at <em>x</em> = 3, our function evaluates to :

f(x)=9-(3)^2=0

So, our second point is (3, 0).

Then by the slope formula, our average rate of change will be:

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3 years ago
What are some ways we can tell that 7x + 2 is not equivalent to 9x?
vlabodo [156]

Answer:

To determine if two fractions are equivalent, cross multiply. To cross multiply, you multiple the numerator of the first fraction by the denominator of the second. Then you multiply the denominator of the first fraction by the numerator of the second. If the two numbers are equal, the fractions are equivalent

Step-by-step explanation:

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