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In an Asian country with a population of 6 million people, 60,000 deaths occurred during the year ending December 31, 1995. These included 30,000 deaths from cholera in 100,000 people who were sick with cholera.
1. What was the cause-specific mortality rate from cholera in 1995?2. What was the case-fatality rate from cholera in 1995?
Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
Under ordinary traffic conditions. What is the probability that a single car chosen at random will travel through the tunnel in 10 minutes?
LSAT scores are normally distributed, with a mean of 150 and s = 10.
A sample of 40 ovservations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observers is selected from a second population.
Why do the critical values from the Chi-square distribution get larger as the degrees of freedom get larger? Recall that this is opposite the pattern for the t-table.
Assume a normal distribution applies and alpha = 0.05 (Use Z table), find the Critical value for the alternative hypothesis:
Explain what you know about hypothesis and hypothesis testing. Describe the five-step hypothesis-testing procedure? Discuss the concepts of Type I and Type II Errors?
In a survey about soft drinks it was found that 5% of the respondents like diet soft drinks. 12% of them liked the brand Coke. Of all the Diet soda drinkers 40% liked Coke.
Compare the two forecasts computed in (a) and (b), using MAD. Which one should the dealer use for January of the next year?
Probability using discrete distribution.The probability distribution for the random variable x follows.
Why is expectation important? Explain what the expected value of an experiment or a business represents. What does it mean to have an expected value of 0? Provide an example of expectation and the use of the formula for expected value.
In a test of the independence of two variables, one of the variables has two possible categories and the other has three possible categories.
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