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Mazyrski [523]
3 years ago
11

A certain company produces fidget spinners with ball bearings made of either plastic or metal. Under standard testing conditions

, fidget spinners from this company with plastic bearings spin for an average of 2.7 minutes, while those from this company with metal bearings spin for an average of 4.2 minutes. A random sample of three fidget spinners with plastic bearings is selected from company stock, and each is spun one time under the same standard conditions; let x¯1 represent the average spinning time for these three spinners. A random sample of seven fidget spinners with metal bearings is selected from company stock, and each is likewise spun one time under standard conditions; let x¯2 represent the average spinning time for these seven spinners. What is the mean μ(x¯1−x¯2) of the sampling distribution of the difference in sample means
Mathematics
1 answer:
azamat3 years ago
6 0

Complete Question:

A certain company produces fidget spinners with ball bearings made of either plastic or metal. Under standard testing conditions, fidget spinners from this company with plastic bearings spin for an average of 2.7 minutes, while those from this company with metal bearings spin for an average of 4.2 minutes. A random sample of three fidget spinners with plastic bearings is selected from company stock, and each is spun one time under the same standard conditions; let x¯1 represent the average spinning time for these three spinners. A random sample of seven fidget spinners with metal bearings is selected from company stock, and each is likewise spun one time under standard conditions; let x¯2 represent the average spinning time for these seven spinners. What is the mean μ(x¯1−x¯2) of the sampling distribution of the difference in sample means x¯1−x¯2 ?

A . 3(2.7)−7(4.2)=−21.3

B . 3−7=−4

C . 2.7−4.2=−1.5

D . 2.73−4.27=0.3

E. 4.2−2.7=1.5

Answer:

option C

Step-by-step explanation:

The mean of the sampling distribution of the difference of the sample means will be equal to the difference in population. Here, our answer is: 2.7 - 4.2 = -1.5.

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Otrada [13]

Answer:

adjacent, supplementary

Step-by-step explanation:

"Two lines intersecting in a right angle with a square indicating a right angle in quadrant one and a ray splitting quadrant two with a two labeling the left angle and one labeling the angle on the right"

Based on your description, it seems like they are right next to each other and equal 180 (straight line)

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7 0
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vredina [299]
We know that

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3 years ago
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8 0
3 years ago
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4 0
3 years ago
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Mandarinka [93]

Answer:

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Step-by-step explanation:

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3 years ago
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