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State the research hypothesis and decide to conduct one or two-tailed test
Data from the MTF 2006 survey reveal that 71.5% (432 out of 604) of males and 74% (562 out of 756) of females reported trying alcohol. Your wonder whether there is any difference between males and females in the population trying alcohol (this variable does not measure regular use, only if the student had ever tried alcohol). Use a test of the difference between proportions when answering these questions.What is the research hypothesis? Should you conduct a one- or a two-tailed test? Why?
Dunn Poitiac has compiled the following sales data regarding the number of cars sold over the past 60n selling days. Answer the following questions for the sales data shown.
Establish an approximate design to MTBF required for a system that will result in an approximate minimum total cost over a five year period if the system is to be operated 7500 hours per year
Suppose that the number of babies born during an hour at a hospital's maternity wing follows a Poisson distribution with a mean of 4 per hour.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
What is the appropriate conclusion based on the outcome of the hypothesis test?
Do you benefit by using a cum sum chart rather than a control chart?
Explain the value of test statistic using t distribution for the given value. Illustrate value of the t test statistic if you are testing a hypothesis.
The critical F value with 6 numerator and 60 denominator degrees of freedom at α = .05 is:
For a new HDTV the mean number of months until repairs are needed is 36.84 with a standard deviation of 3.34 months.
Karefree State University has an enrollment of 18,000. Researchers took a sample of 900 and found 477 students wanted a Field Hockey team. Construct the 95% and 99% Interval estimates for the population proportion.
First explain what the Gini coefficient is and what hypothetical Gini values of 0 and 1 mean. Sort the data by the Gini coefficient in 2000 and look at the list of countries.
What is the chance that stock will fall by more than 15% next month? What extra assumption are you making when replying this question?
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