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In-s [12.5K]
3 years ago
15

25/75 = x/15 what is x

Mathematics
1 answer:
liq [111]3 years ago
8 0

Answer:

x=5

Step-by-step explanation:

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As a manager for an advertising company, you must plan a campaign designed to increase Twitter usage. A recent survey suggests t
kolbaska11 [484]
Given:
Sample proportion = 85% = 0.85.
Confidence level (CL) = 90%.
Confidence interval (CI) \hat{p} \pm z^{*} \sqrt{ \frac{\hat{p}(1-\hat{p})}{n} }  \\ where \\ n=sample\, size \\ z^{*}=1.645 \, at \, 90\% \, CL

We want the confidence interval to be 5% or 0.05. Therefore
0.85 - 1.645 \sqrt{ \frac{0.85(1-0.85)}{n} }=0.05 \\ 0.85 -  \frac{0.5874}{ \sqrt{n} } =0.05 \\  \frac{0.5874}{ \sqrt{n} }=0.8 \\  \sqrt{n} = .7342 \\ n=0.54

Because this number is less than 1, a default sample size of 30 (for the normal distribution) is recommended.

Answer: 30

3 0
3 years ago
What is the length of a rectangle with width 12 inches and an area of 66 inches^2
sammy [17]

Answer:

The length is 5.5 inches

Step-by-step explanation:

The area of a rectangle is

A = lw

66 =  l * 12

Divide each side by 12

66/12 = l

5.5 = l

The length is 5.5 inches

8 0
3 years ago
Read 2 more answers
How many ways are
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3 0
2 years ago
​A manager wants to know if the mean productivity of two workers is the same. For a random selection of 30 hours in the past​ mo
vekshin1

Answer:

A.The data should be treated as paired samples. Each pair consists of an hour in which the productivity of the two workers is compared.

Explanation:

If the mean productivity of two workers is the same.

For a random selection of 30 hours in the past month, the manager compares the number of items produced by each worker in that hour.

There are two samples and the productivity of the two men is paired for each hour.

7 0
3 years ago
The number of small lawns Isabella can rake depends on the amount of time she spends raking. Isabella can rake 3 lawns in 3.75 h
ycow [4]

Answer:

1) 4      2)7

Step-by-step explanation:

1) If we divide 3.75/3=1.25 which is the amount of time she takes per yard so if we add another yard to what she has already done we find she only could do one more yard in 5 hours 3.75+1.25=5.00 So she can only rake 4 yards in 5 hours

2) If we divide 20.25/3=6.75 we find that each ticket is $6.75 so we must divide that by 47.25 to get the amount of tickets 47.25/6.75=7


6 0
3 years ago
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