Determining the standard error of the mean
If the standard deviation of a normally distributed population is 20.0 and we take a sample of size 4, then the standard error of the mean is 10.0
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Define a random variable for the grocery store customer's shopping time. Give the distribution and parameter(s) and state the support. What is the probability that a customer gets a parking ticket?
The average yearly cost per household of owning a cat is $183.80. Suppose that we randomly select 36 households that own a cat. What is the probability that the sample mean of these 36 households is more than $175.00? Assume standard deviation of
Assume that cans of a X-brand of soda are filled so that the actual amount have a mean of 12.00 oz and a standard deviation of 0.11 oz. Find the probability that a sample of 36 cans will have a mean amount will be between 12.11 and 12.19 oz.
The average number of mosquitos in a stagnant pond is 70 per square meter with a standard deviation of 12. If 9 square meters are chosen at random for a mosquito count, find the probability that the average of those counts is more than 73.6 mosqui
You are choosing between the following investment strategies: Invest $200 in stock A. Stock A costs $20 per share. Expected yield per share of stock A is $2, and the variance of yield per share is 9 ($-squared).
A Statistical Consulting Center receives on average 2 new consulting applications per week. ( The Center is open 5 days per week ). Let T be the weekday waiting time (in days) for receiving next applications , which is of the following is true?
A purchaser of electrical components buys them in lots of size 10. It is his policy to inspect 3 components randomly from a lot and to accept the lot only if all 3 are nondefective. If 30 percent of the lots have 4 defective components and 70 per
An oil company conducts a geological study that indicates that an exploratory oil well should have a 20% chance of striking oil. What is the probability that the first strike comes on the third well drilled?
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