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lina2011 [118]
3 years ago
9

A curious accountant at a large firm would like to know if money can buy happiness. She selects a random sample of 30 of her wea

lthy clients and contacted them to ask "On a scale of 1-100, how happy are you?" The resulting 95 percent confidence interval for the true mean happiness rating for all wealthy customers is (67.5, 89.5). Which of the following statements best summarizes the meaning of 95% confidence?
(A) Approximately 95% of the wealthy customers in the survey reported having happiness ratings between 67.5 and 89.5.
(B) Approximately 95% of the wealthy customers at this firm have happiness ratings between 67.5 and 89.5.
(C) A wealthy customer selected at random from this population has a happiness rating between 67.5 and 89.5 95% of the time.
(D) About 95% of all random samples of 30 wealthy customers from this population would result in a 95 percent confidence interval of (67.5, 89.5).
(E) About 95% of all random samples of 30 wealthy customers from this population would result in a 95 percent confidence interval that captures the population mean happiness rating.
Mathematics
1 answer:
vova2212 [387]3 years ago
6 0

Answer:

nn

Step-by-step explanation:

nn

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I would say that the answer is D 21.63
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Which equation would intersect the line on the graph at the point (1, 2)<br>​
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Help again and thanks..........
LenKa [72]

Answer:

  • a = $8
  • s = $5

Step-by-step explanation:

When the coefficients don't lend themselves to solution by substitution or elimination, then Cramer's Rule can be useful. It tells you the solutions to

  • ax +by = c
  • dx +ey = f

are ...

  • ∆ = bd -ea
  • x = (bf -ec)/∆
  • y = (cd -fa)/∆

Using that rule here, we find ...

  ∆ = 5·3 -6·2 = 3

  a = (5·54 -6·41)/3 = 5·18 -2·41 = 90 -82 = 8

  s = (41·3 -54·2)/3 = 41 -18·2 = 5

This math can be performed in your head, which is the intent of formulating the rule in this way.

_____

Similarly, if you expect the solutions to be small integers (as here), then graphing is another viable solution method.

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<em>Comment on the question</em>

We're sad to see than only 16 tickets were sold to the two performances by the symphonic band.

6 0
3 years ago
The ratio of a to b is 9:2, and the ratio of c to b is 5:3. What is the ratio of a to c?
xz_007 [3.2K]
The answer is that the ratio of a to c is 9/5
8 0
3 years ago
Can someone explain this a little better?
galina1969 [7]

Answer:

i believe 0.67 of a chance

Step-by-step explanation:

since there are two jobs and a chance that he won't get either that's three options. so the denominator is three (as a fraction). there are two jobs so the probability of James getting one of the two is 2/3. 2/3 as a decimal is 0.66666 and keeps going on and on forever. Rounded to the nearest hundredth, 0.666666 is 0.67.

4 0
3 years ago
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