When the product of 5 and a number is increased by5, the result is 17.Find the number
1 answer:
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Answer:
After replace we got for the interval:
For this case since the interval have just negative values then we can conclude that at 1% of significance the mean for the old case is lower than the mean for the new machine and for this case we can conclude that the new machine reduce the times to pack the jars.
Step-by-step explanation:
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
For this case we assume the following:
represent the man for old case
represent the man for new case
deviation for the old case
deviation for the new case
For this case we want to find a confidence interval for the difference of means and they can use the following formula:
After replace we got for the interval:
For this case since the interval have just negative values then we can conclude that at 1% of significance the mean for the old case is lower than the mean for the new machine and for this case we can conclude that the new machine reduce the times to pack the jars.