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Verdich [7]
3 years ago
7

In order to estimate the average time spent per student on the computer terminals at a local university, data were collected for

a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.8 hours.
The standard error of the mean is:

a) 7.50 b) 0.39 c) 2.00 d) 0.20
Mathematics
1 answer:
d1i1m1o1n [39]3 years ago
4 0

Answer: option D

Step-by-step explanation:

The formulae for standard error = standard deviation/√n

But population standard deviation = 1.8 and sample size = n = 81

Standard error = 1.8/√81 = 1.8/9 = 0.2

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anyanavicka [17]

Answer:

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Step-by-step explanation:

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5 0
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When asked to write the domain for the equation y= |x - 6| + 3, Mary wrote the Domain is y < 3. What mistake(s) did Mary make
castortr0y [4]

Answer:

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In this case, we have:

y = Ix - 6I + 3.

Notice that there is no restriction here, x can actually take any value, then the domain will be the set of all real numbers.

The correct domain is x, x ∈ R

Now, if we had (for example) something like:

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Now we have a restriction in the domain because we can not have y equal or larger than 3.

To find the domain, we can break the absolute value:

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6 0
2 years ago
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german

Answer:

\dfrac{x^4y^4}{81}

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4 0
3 years ago
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PilotLPTM [1.2K]

Answer:

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Let's break the the parentheses down into 2 separate formulas.

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3 years ago
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