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A random sample of 56 fluorescent light bubs has a mean life of 645 hours with a standard deviation of 31 hours.
A) Construct a 95% confidence interval for the population
B) How would you increase the accuracy in this problem?
At the .05 significance level, can we conclude that the guideline is still reasonable?
Construct a 95% confidence interval for the proportion of all those who experience some type of discomfort.
Take your data and arrange it in the order you collected it. Count the total number of observations you have, and label this number N. Then create another set of data starting from one and increasing by one until you reach N.
Chi square compares actual data with expected data. What would the expected data be? For example, if I know the percentage of brown M&Ms in a bag is 40% set by the company
Find out the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect? What percent of the garages take between 29 hours and 34 hours to erect?
In an article in Accounting and Business Research, Carslaw and Kaplan investigate factors that in?uence "audit delay" for ?rms in New Zealand.
Suppose the world series is about to begin. Some people get together and each decide to predict different win-loss patterns for the seven possible games during the coming series.
A random sample of n = 4 scores is obtained from a normal population with = 20 and = 4. What is the probability of obtaining a mean greater than M = 22 for this sample?
What is an interaction? Describe an example; what are the variables within your population (work, social, academic, etc.) for which you might expect an interaction.
To test whether there is significant mean difference between two groups using independent sample t test.
For a sample of students in the college of business administration at mid-atlantic university, the mean grade point average is 3.10 with a standard deviation of 0.25.
The credit score of a 35 year old applying for a mortgage at Ulysses Mortgage Associates is normally distributed with a mean of 600 and a standard deviation of 100.
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