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maks197457 [2]
3 years ago
11

A study is conducted to investigate whether customer satisfaction is greater among computer companies that offer tech support ve

rsus those that do not offer tech support. A random sample of 50 customers are selected from among those that purchased computers that offer tech support. A separate random sample of 40 customers are selected from among those that purchased computers that do not offer tech support.
The study found that the mean satisfaction rating was significantly greater among customers that purchased computers that offer tech support.
Which of the following is the best description of this study?
(A) An experiment using a completely randomized design.
(B) An experiment using a randomized block design.
(C) An experiment using a matched pairs design
(D) An observational study using a simple random sample.
Mathematics
1 answer:
TiliK225 [7]3 years ago
7 0

Answer:

The correct answer is (E).

This is not an experiment because no treatment is being imposed upon the customers. Additionally, this study used a stratified sample because independent random samples were selected from two distinct populations of customers.

Step-by-step explanation:

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4 years ago
Read 2 more answers
the height of a square pyramid is one half the length of each side. the volume of the pyramid is 972in ^3. what is the height of
slavikrds [6]

Answer:

18.7 inches

Step-by-step explanation:

The question says that the height of a square pyramid is one half the length of each side. the volume of the pyramid is 972in³ and we are now asked to find the height of the pyramid

----The volume of a square pyramid is

V = A(h/3)

And since the height is one half(3/2) of the base

Let's assume that the base is y inch

Height = 3/2 × y,

Base area = y × y = y²

Volume of the pyramid = 3/2 × y × y² ÷ 3 = 972

Y/2 × y² = 972

Y³ = 1944

Y = ³√1944

Y = 12.48

Since the lenghy of the base is 12.48 in

And the height us 3/2 of y,

H = 3/2 × 12.48

Height is 18.7 inches

4 0
3 years ago
What are the answers to this? PLEASE HELP.
shepuryov [24]

Answer:

Ray : Line NA, Line NB, Line AB

Vertex : Vertex N

Angle: Angle ANB

Parallel Lines: None

Coplanar Points: Points C, A, F, N, B

Collinear Points: Points A, N, B

Segment Addition Postulate: AN + NB = AB

Perpendicular Lines: None

6 0
4 years ago
A sprinter finished a 100-meter race in a time of 12.63 seconds.
const2013 [10]

Answer:

1263 seconds

Step-by-step explanation:

100 meters = 12.63 seconds

multiply both sides by 100 since

100*100= 10,000 meters

12.63*100= 1263 seconds

3 0
3 years ago
Which equation is not equivalent to the formula d = rt? r equals t over d r equals d over t t equals d over r d = tr
Gennadij [26K]
Question restated.
which is not equivalent to d = rt?
r = t/d
r = d/t
t = d/r
d = tr
If we divide both sides of the original equation by t, we are left with r = d/t, so we know that this is true. if we compare this, however, with the first item on the list, we can see that t/d does not equal d/t, so the first item on the list is the wrong one.
3 0
3 years ago
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