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The number of hours that a network server was down each month of the previous year is: 4, 4, 5, 1, 5, 1, 1, 2, 1, 2, 1, 2. Place a 95% confidence interval about the population mean number of down hours per month.
My thoughts:
mean = 29 / 12 = 2.4167
mean + Z(0.025) * s/sqrt(n)
mean - Z(0.025) * s/sqrt(n)
If you assume returns follow a normal distribution, which investment would give a better chance of getting at least a $40 million return? Explain. (B) How could your answer to part (A) change if you knew returns followed a skewed distribution inst..
When making the histogram from frequency table, (a) what goes along the bottom, (b) what goes along the left edge, and (c) what goes above each value?
Suppose 100 randomly selected customers were asked to rate a particular service they recently had on a scale of 0 to 10. The sample mean rating was found to be 7.3.
This activity is a revision of an activity found in Real Data: A Statistics Workbook Based on Empirical Data by Z. C Holcomb (1997). Published by Pyrczak Publishing.
Please choose one of the probability constructs below. Then, identify a peer-reviewed journal article that highlights the construct. Compose a post in which you summarize and evaluate the construct's use in the research study.
Recent crime reports indicate that 5.2 motor vehicle thefts occur each minute in the United States. Assume that the distribution of thefts per minute can be approximated by the Poisson probability distribution.
What additional information is obtained from measurements on an ordinal scale compared to measurements on a nominal scale?
Given that both balls selected are white what is the probability that bowl 3 was selected?
Can we compute the mean length of stay of workers at the company differs from the mean length of stay at that dangerous industry.
Looking at the data, the manufacturer is incorrect in its label claim. Perform hypothesis testing to prove or disprove it. Is the manufacturer correct in its label claim? Explain.
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this the right interpretation for the margin of error?
A cell phone company collects data from a random sample of 500 households. The results indicate that 135 of the households would add an extra cellular number, provided it was offered at a reduced monthly cost.
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