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A mandatory comptency test for high school sophmores has a normal distribution with a mean of 400 and a standard deviation of 100. The top 3% of students receieve $500. What is the minimum score you would need to receive this money? Calculate the z-score.
What is the probability that between 133 and 171 of the business travelers say that the reason for their most recent business trip was an internal company visit?
A normal population has an average of 80 and a standard deviation of 10. You select a sample of 25. Calculate the probability that the sample mean
The data is shown on the table. Is there a difference in mean SBP between treatments? Run the appropriate test at α= 0.05
If one investment can give you $1200 with a probability of .20 and you could lose $800 with a probability of .80, and another investment can give you $600 with a probability of .70 and a loss of $300 with a probability of .30, which investment is ..
From past estimates, manager thinks that about 4% of customers have expressed dissatisfaction. What sample size must you use for this survey?
How long do new batteries last on a camping trip? A random sample of n1 = 42 small camp flashlights were installed with brand I batteries and left on until the batteries failed.
Consider a random sample of size n from a normal distribution, Xi ~ N(m,9). a) Find the CRLB for the variances of unbiased estimators of m. b) Is the MLE, m(hat) = X(bar), a UMVUE of m?
A film developer claims that the mean number of pictures developed for a camera with 24 exposer is less than 22. If the hypothesis test is preformed, how should you interpret a decision a)reject the null hypothesis and b) fail to reject the null h..
What is the relationship between the amount spent per week on food and the size of the family? Do larger families spend more on food?
At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of money a shopper spends at the store we could
If the process mean and standard deviation remain constant, what proportion of the output from this process will be defective?
A t-distribution to create 90% confidence interval for population mean. If convenient, use technology to create the confidence interval.
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