The Weston Rescue Service and the Mid-Valley Ambulance Service are tested for response times. A sample of 50 response times from the Weston firm produces a mean of 12.2 minutes and a standard deviation of 1.5 minutes. A sample of 50 response times from Mid-Valley produces a mean of 14.0 minutes and a standard deviation of 2.1 minutes. Use these data and good form to determine whether Weston has a faster response time than Mid-Valley. Use a 0.05 significance level.
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
- The Weston Rescue Service and the Mid-Valley Ambulance Service are tested for response times. A sample of 50 response times from the Weston firm produces a mean of 12.2 minutes and a standard deviation of 1.5 minutes. A sample of 50 response times from Mid-Valley produces a mean of 14.0 minutes and a standard deviation of 2.1 minutes. Use these data and good form to determine whether Weston has a faster response time than Mid-Valley. Use a 0.05 significance level.
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