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An electronics device emits a timing signal that should be as close to 300 milliseconds as possible (the historical process standard deviation is 5 milliseconds). A hypothesis test is setup so that, periodically, 40 devices are inspected to determine if the process average differs from the 300 millisecond target.
Forty devices are inspected with the following results (time in ms):
301.9 301.1 306.5 307.1 308.3299.4 298.9 298.3 294.7 293.0303.0 293.9 294.9 302.6 304.5297.5 304.3 293.2 303.9 301.8293.7 301.1 308.1 293.9 307.2307.6 302.8 304.9 303.0 302.6298.6 293.2 306.4 304.5 296.5305.9 301.1 303.8 307.5 304.2
A run chart is developed that confirms process stability. The level of significance is chosen to be 0.01.
a. Is there evidence to suggest that the process average differs from the target value?
b. What is the p-value in this situation?
Determine future value of annuity due which has $750 deposited at the starting of each month for 15 years at 5.9% compounded monthly.
There're several measures of central tendency. By far the most frequently utilized of these measures is mean of population. Remember that the source of the data that you want to analyze always comes from what is called a population.
Find the probability that at least one subject experiences headaches. Is it unusual to have at least one of six subjects experience headaches?
Find the mean, median, mode, and midrange for these data.
Make a histogram for the r probability distribution.
Super Markets, Inc. is considering expanding into the Scottsdale, Arizona, area. Ms. Luann Miller, Director of Planning, must present an analysis of the proposed expansion to the operating committee of the board of directors
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
(a) At the 5 percent level of significance, does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule. (b) Is this a close decision?
Determine probability that student was sophomore? Determine the probability of selecting a face card from deck of 52 cards.
The random variable x has a normal distribution with mean=30 and standard deviation = 30. Find the probability that x assumes a value more than two standard deviations from its mean more than three standard deviations from the mean.
Compare two models. Model #1 has an r-squared of .55 and an adjusted r-squared of .50. Model #2 has an r-squared of .52 and an adjusted r-squared of .51. Given this information, what model should you use?
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
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