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crimeas [40]
3 years ago
14

Do consumers spend more on a trip to Store A or Store​ B? Suppose researchers interested in this question collected a systematic

sample for 85 Store A customers and 82 Store B customers by asking customers for their purchase amount as they left the store. Using the given summary​ statistics, researchers calculated a​ 95% confidence interval for the mean difference between Store A and Store B purchase amounts. The interval was ​($negative 15.96​,$negative 4.04​). Explain in context what this interval means.
Mathematics
1 answer:
FinnZ [79.3K]3 years ago
4 0

Answer:

We can be 95% confident that consumers spend between $4.04 and $15.96 less at Store A than the consumers spend at Store B.

Step-by-step explanation:

Confidence Intervals give an estimate as range of values for a statistic concerned at a <em>confidence level</em>.

In this case the statistic is the mean difference between Store A and Store B purchase amounts and the confidence level is 95%.

Confidence Interval can be calculated using M±ME where

  • M is the sample mean difference between Store A and Store B purchase amounts
  • ME is the margin of error from the mean
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Answer:

66.67%

Step-by-step explanation:

total matches = 9

matches won = 6

percentage = matches won*100/ total matches

percentage = 600/9

= 66.67%

7 0
3 years ago
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The correct answer is B.

6x*6x=36x

-8*+8=-64

Thus, our equation is 36x-64

Hope this helps!

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3 years ago
Using the properties of inequalities, write down the inequality that you will get if you: add the number –5; 2.7; 7; to both sid
puteri [66]

Answer:

See below

Step-by-step explanation:

1..........................

  • 18 >−7

Add –5; 2.7; 7 to both sides

  • 18 -5 > -7 - 5 ⇒ 13 > -12
  • 18 + 2.7 > - 7 + 2.7 ⇒ 20.7 > - 43
  • 18 + 7 > -7 + 7 ⇒ 25 > 0

2..........................

  • 5 > -3

Subtract 2; 12; -5 from both sides

  • 5 - 2 > -3 -2 ⇒ 3 > - 5
  • 5 - 12 > -3 - 12 ⇒ -7 > -15
  • 5 -(-5) > -3 - (-5) ⇒ 10 > 2

3..........................

  • - 9 < -6

Multiply both sides by 3; −3; −1

<em>When multiplying both sides of inequality by positive number the sign stays as is, when multiplying both sides of inequality by negative number the sign reverses</em>

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7 0
3 years ago
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igor_vitrenko [27]

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Step-by-step explanation:

3 0
3 years ago
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Arlecino [84]

Answer:

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Step-by-step explanation:

We have the following function

f(x) = \left\{        \begin{array}{ll}            cx^2+5x & \quad x

For the function f(x) to be continuous on (-\infty,\infty) it is sufficient to have continuity at x = 6, we need to ensure that as x approaches 6, the left and right limits match, this means that

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6 0
3 years ago
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