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Musya8 [376]
2 years ago
5

The manager of a grocery store has selected a random sample of 100 customers. The average length of time it took these 100 custo

mers to check out was 3.0 minutes. It is known that the standard deviation of the checkout time is 1 minute. Refer to Exhibit 8-2. If the confidence coefficient is reduced to .80, the standard error of the mean _____. a. becomes negative b. remains unchanged c. will increase d. will decrease
Mathematics
1 answer:
Tanya [424]2 years ago
7 0

Answer:

b. remains unchanged

Step-by-step explanation:

Formula for standard error of mean is;

SE = σ/√n

From the above, we can see that the standard error of mean is independent of the confidence coefficient as it doesn't affect the SE.

Now, we are given that;

random sample; n = 100

Standard deviation; σ = 1

Thus;

SE = 1/√100

SE = 1/10

Now, even if the confidence coefficient is reduced, we can see that it has no impact on the standard error of mean.

Thus, SE remains unchanged.

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Can anyone teach me how to solve this?
Bumek [7]

Answer:

x=11

Step-by-step explanation:

First you need to make those numbers into an equation. So you will have 4x+4=48. First you have to get the 4 on the other side so you do the opposite of the symbol and subtract 4 from 48 to get 44. So now you have 4x=48. Now you do the opposite og multiplication so you divide 44 by 4 and you get 11. Hope this helped :) I would appreciate it if you made this brainiest answer  

5 0
2 years ago
Determine the maximum number of zeros. Then, determine the x-intercepts of the function. x^3-3x^2-22x+24
JulijaS [17]

Answer:

Three zeros x=-4,\ x=1,\ x=6

x-intercepts: (-4,0), (1,0), (6,0)

Step-by-step explanation:

Plot the graph of the function y=x^3-3x^2-22x+24 on the coordinate plane. This graph intersects the x-axis at three different points (see attached diagram):

  • (-4,0);
  • (1,0);
  • (6,0).

This means x=-4,\ x=1,\ x=6 are zeros of the function y=x^3-3x^2-22x+24

6 0
3 years ago
Just divide and check,<br><br>(x^2 + 7x + 10) ÷ (x + 2)<br><br>​
Serggg [28]

Answer:

x+5

Step-by-step explanation:

so first you would divide by x (which means you would multiply x+2 by -x)

x^2 + 7x + 10

-x^2 - 2x

5x + 10

then you would divide by 5 (which means you would multiply x+2 by -5)

5x + 10

5x +10

0

So then to check it you would multiply x+5 by x+2

(x+5)(x+2)

x^2 + 2x + 5x + 10

then simplify to get

x^2 + 7x + 10

3 0
3 years ago
Mia’s work to find the slope of a trend line through the points (3, 10) and (35, 91) is shown below.
pochemuha
For this case the first thing you should know is that by definition the slope of the line is given by:
 m = (y2-y1) / (x2-x1)
 Where we have two ordered pairs:
 P1 = (x1, y1)
 P2 = (x2, y2)
 We observe then that according to the formula, the error of mine was to invert the numerator with the denominator.
 Answer: 
 C: Mia switched the numerator and the denominator.
5 0
3 years ago
Read 2 more answers
What is the solution to f(-2)=-|-2-2|
nexus9112 [7]

Answer:

f = -4

Explanation:

  • f(-2) = -|-2 - 2|

Subtract The Numbers: -2 - 2 = 4

f = -| -4|

Apply Absolute Rule (|-a| = a): |-4| = 4

f = -4

3 0
3 years ago
Read 2 more answers
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