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The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customers to check out was 3.0 minutes. It is known that the standard deviation of the population of checkout times is one minute. With a .95 probability, the sample mean will provide a margin of error of?
Formulate a linear programming model for this problem (using QM on Windows and/or Excel on Windows)
Is there significant evidence that this production run doesn't meet specifications? Use a 1% level of significance.
The sample produced a mean of 535 mL with a standard deviation of 0.47 mL. Assume that the distribution of the amount of lotion is approximately normal.
The mean is 75 and the standard deviation is 6. If 1200 students took the test, approx how many students would be expected to score between 69 and 81?
The heights of north American women are normally distributed with a mean of 64 inches and a standard deviation of 2 inches.
A video rental store has two video cameras available for customers to rent. Historically, demand for cameras has followed this distribution:
Find the largest number of room reservations that this hotel can book and still be at least 95% sure that everyone who shows up at the hotel will have a room on a given night.
A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 30.
How have you used the scientific process (unsystematic observation, building theories, and evaluating propositions) in your life to better understand your personality?
What fraction of cups will probably overflow if 230-milliliter cups are used for the next 1000 drinks? 0.0228 or 23 out of the 1000 drinks will overflow.
Preference to change blades is recorded. Do the data support the twin-blade manufacturer's claim? α=.05. This is a t-tests independent samples.
Using the information provided in part (d) would you be surprised if a sample of 50 differences collected in this way resulted in a higher mean number of unpopped kernels for the store brand than for the name brand?
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