The First Unit Took 10 Hours and the Fourth Unit

question 35

Multiple Choice

The first unit took 10 hours and the fourth unit 8.1 hours. What is the improvement rate?

• A) 99%
• B) 95%
• C) 90%
• D) 15%
• E) 10%

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Definitions:

Interval Estimation

A range of values, calculated from sample data, that is likely to contain the value of an unknown population parameter.

Test Statistic

A value, derived from sample data, used in hypothesis testing to determine whether to reject the null hypothesis.

Sample Standard Deviation

A measure of the variability or dispersion of a sample data set, quantifying the extent to which the numbers vary from the sample mean.

Confidence Interval Estimate

A range of values, derived from sample data, that is likely to contain the value of an unknown population parameter, with a specified level of confidence.