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The effect of sample size on the standard deviation. Assume that the standard deviation in a very large population is 100.
Provide answers to the following items (a) - (c):
(a) Calculate the standard deviation of the sample mean for samples of size 1, 4, 25, 100, 250, 500, 1000, and 5000.(b) Graph your results with the sample size on the x axis and the standard deviation on the y axis.(c) Summarize the relationship between the sample size and the standard deviation that you showed in your graph.
The length of a particular telemarketing phone call has an exponential distribution with a mean equal to 1.5 minutes. Find the probability that the length of a randomly selected call will be between 30 - 50 minutes and 1 minuter or longer.
Critically discuss why the dowload is a continous numerical varaible and critically discuss why the download time is a ratio scaled variable.
An electric power trading company has an option to buy 1,000,000 terawatts of electricity from a producer for $10 per terawatt. Other electric power trading companies have received this option and the company knows a decision must be made quickly.
The standard screening test for Down's Syndrome is based on combination of maternal age and the level of serum alpha-fetoprotein. Using this test 80% of Down's syndrome cases can be identified, while 5 % of normals are detected as positive.
Six employees who have formed a car pool. If only four of these employees can drive, how many possible seating arrangements are there for the group?
A ball is drawn, and then it and another ball of the same color are placed back in the urn. Finally, a second ball is drawn. What is the probability that the second ball drawn is white?
Using an investment game, the study demonstrated that people who inhaled oxytocin were more likely to give their money to a trustee compared to people who inhaled an inactive placebo. For this experimental study, identify the independent variable ..
Assume sps professors have the average life normally distributed of 82 years, with population standard deviation of 5 years. Determine percent of sps professors will not live more than 80 years?
a) Do a test to see if workers attitudes on this matter have changed using a 90% alpha. b) Explain to management what your findings are and what this suggests about future decisions vs work options.
Compute a 95% confidence interval for the population mean, based on the sample 1, 2, 3, 4, 5, 6, and 30. Change the number from 30 to 10 and recalculate the confidence interval.
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
In a study about postage tariffs and revenue, the European Economic Community wanted to look at the relationship between the number of postal employees in a country and the amount of domestic mail that was processed. They collected data for six di..
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