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The population mean waiting time to check out of a supermarket has been 10.73 minutes. Recently, in an effort to reduce the waiting time, the supermarket has experimented with a system in which there is single waiting line with multiple server checkouts. A sample of 100 customers was selected, and their mean waiting time to check out was 9.52 minutes, with a SD of 5.8 minutes.
a) At the 0.05 level of significance, is there evidence to suggest that the population mean waiting time to check out is less than 10.73 minutes?
b) What is the p-value?
How many observations were in the original data set? In the bottom row of the stem and leaf display identify the stem the leaves and the numbers in the original data set represented by this stem and its leaves.
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Show draw a cause-and-effect diagram to organize the possible causes of delayed flight departures into the following maj categories.
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The weight of a small Starbucks coffee is a normally distributed random variable with a mean of 370 grams and a standard deviation of 15 grams. Find the weight that corresponds to each event:
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If you arbitrarily grab 2 socks out of drawer determine the probability that you grab a matching pair?
Create probability tree showing all marginal, conditional, and joint probabilities. Create a joint probability table.
Would it be reasonable to conclude that the population distribution is Poisson with a mean of 2.0?
A large tank of fish from a hatchery is being delivered to a lake. The hatchery claims that the mean length of fish in the tank is 15 inches, and the standard deviation is 2 inches. A random sample of 36 fish is taken from the tank.
Perform a hypothesis test by using.04 level of significance to find out if there is a difference between the population means.
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