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The amount of time it takes students to complete a biology exam is normally distributed with a population mean of u=120 minutes and a standard deviation o=30 minutes. Given samples of 25 randomly selected students, compute the standard deviation of the sampling distribution of X
You are working on an analysis of your company's current cost structure reviewing the various fixed and variable costs within your firm.
1. for a standard normal model find the z-value that is less than the mean and for which 67 of the area under the
a. Specify the null and alternative hypotheses to test the diet center's claim. b. Calculate the value of the test statistic T.
The following data are indexed prices of gold and copper over a 10-year period. Assume that the indexed values constitute a random sample from the population of possible values. Test for the existence of a linear correlation between the indexed pr..
A pizza can be ordered with up to four different toppings. Find the total number of different pizzas (including no toppings) that can be ordered.
At the 0.05 level, is the 40% rate significantly greater than the 35% that had been occurring in the past, or might this higher rate be simply due to chance variation? Identify and interpret the p-value for the test.
When we talk about pH we are referring to the concentration of hydronic my ions present. If the concentration of hydronium in a solution
a. What is the population proportion of people who moved to the suburb in the last five? years?
Can Instant message replace e mail in the future" - Can Instant message be a primary source of internal communication? -How this instant message system will work? -What cost would be? etc...
What is the median sugar content?- What is the range of the sugar contents of these cereals.- Describe the shape of the distribution.
A population has a mean = 80, with standard deviation = 8. The distribution of sample means for samples of size n = 4 selected from this population would have an expected value of?
a random sample of 225 sat scores has a mean of 1500. assume that sat scores have a population standard deviation of
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