The Quality Assurance Department for Cola, Inc., maintains records regarding the amount of cola in its Jumbo bottle. The actual amount of cola in each bottle is critical, but varies a small amount from one bottle to the next. Cola, Inc., does not wish to underfill the bottles. On the other hand, it cannot overfill each bottle. Its records indicate that the amount of cola follows the normal probability distribution. The mean amount per bottle is 31.2 ounces and the population standard deviation is 0.4 ounces. At 8 A.M. today the quality technician randomly selected 16 bottles from the filling line. The mean amount of cola contained in the bottles is 31.38 ounces.i. Is this an unlikely result?ii. Is it likely the process is putting too much soda in the bottles?iii. To put it another way, is the sampling error of 0.18 ounces unusual?Answer the question as business strategic sampling chapter
Question
The Quality Assurance Department for Cola, Inc., maintains records regarding the amount of cola in its Jumbo bottle. The actual amount of cola in each bottle is critical, but varies a small amount from one bottle to the next. Cola, Inc., does not wish to underfill the bottles. On the other hand, it cannot overfill each bottle. Its records indicate that the amount of cola follows the normal probability distribution. The mean amount per bottle is 31.2 ounces and the population standard deviation is 0.4 ounces. At 8 A.M. today the quality technician randomly selected 16 bottles from the filling line. The mean amount of cola contained in the bottles is 31.38 ounces.i. Is this an unlikely result?ii. Is it likely the process is putting too much soda in the bottles?iii. To put it another way, is the sampling error of 0.18 ounces unusual?Answer the question as business strategic sampling chapter
Solution
i. To determine if this is an unlikely result, we need to calculate the z-score. The z-score is a measure of how many standard deviations an element is from the mean.
The formula for the z-score is: Z = (X - μ) / (σ/√n)
Where: X = sample mean = 31.38 ounces μ = population mean = 31.2 ounces σ = population standard deviation = 0.4 ounces n = sample size = 16
Substituting the values into the formula, we get:
Z = (31.38 - 31.2) / (0.4/√16) = 0.18 / 0.1 = 1.8
A z-score of 1.8 is within the range of what is typically considered likely (between -2 and 2). Therefore, this is not an unlikely result.
ii. To determine if it is likely the process is putting too much soda in the bottles, we need to look at the z-score. A positive z-score indicates that the sample mean is greater than the population mean. In this case, the z-score is 1.8, which is positive. Therefore, it is likely that the process is putting too much soda in the bottles.
iii. To determine if the sampling error of 0.18 ounces is unusual, we need to look at the z-score. A z-score of 1.8 indicates that the sampling error is 1.8 standard deviations away from the mean. This is within the range of what is typically considered usual (between -2 and 2). Therefore, the sampling error of 0.18 ounces is not unusual.
Similar Questions
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