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In an examination of holiday spending (known to be normally distributed) of a sample of 16 holiday shoppers at a local mall, an average of $54 was spent per hour of shopping. Based on the current sample, the standard deviation is equal to $21. Find a 90% confidence interval for the population mean level of spending per hour.
the national center for health statistics reports that the mean systolic blood pressure for males 3 to 44 years of age
Use a P-value to test the claim about the population mean using the given sample statistics. State your decision for a=0.05. Claim: mean does not = 230
Find the probability that a randomly selected student spends between eighty and ninety percent of the time on the test. Find the expected value of X. E(X)
Let's further suppose that there was good interrater reliability on these frequency counts of behaviours and that they are interval/ratio level of measure, normally distributed, and independent observations.
Show all work. What is the probability that a randomly selected US resident did not live in Idaho? The total 2008 US population was 303,824,640.
What are the key terms in a verbal hypothesis that signify whether you are conducting a one-tailed or two-test? Give an example and explain your answer.
Suppose in an attempt to develop marketing materials Tyco marketers are interested in determining whether there is a significant difference in the cost of replacing pipeline seals in different countries.
Start rolling dice until a particular number, say 3, is obtained, and keep track of how many rolls are necessary. Repeat 100 times. Then find the average.
What is the appropriate procedure to test for a significant difference in means between the two groups? Implement the procedure in problem using the critical value method
Montreal and ask them if they would be comfortable with a woman asking them out for a date. If the claim made by the study was true, what is the probability that At most 4 men would say no?
Standard deviation was 4.1 years. Suppose the variable is normally distributed. Determine 95% confidence interval of the true mean age.
What is a discrete random variable and how does it differ from a continuous random variable? Give examples.
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