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Find the mean, variance and standard deviation for the following probability distribution:
x P(x)0 0.151 0.392 0.283 0.124 0.06
The question is whether memebership in the aspirin group affects (lowers) the heart attack rate. Why is the question here different from the previous question? What would we expect to see if the two categories are independent?
In a few sentences, describe two designs that can address your research question. The designs must involve two different statistical analyses. For each design, specify and justify each of the four factors and calculate the estimated sample size..
Medical Red Blood Cell Volume. Total blood volume (in ml) per body weight (in kg) is important in medical research. For healthy adults, the red blood cell volume mean is about = 28ml/kg.
Ms. Lisa Monnin is the budget director for the New Process Company. She would like to compare the daily travel expenses for the sales staff and the audit staff. She collected the following sample information.
The national average SAT score is 1019. If we assume a normal distribution with σ = 90, what is the 90th percentile score? What is the probability that a randomly selected score exceeds 1200?
One component of the Drug Court program is frequent random drug testing for a variety of drugs – THC, Meth, Cocaine (crack or powder), Opiates (painkillers), Barbiturates, Benzodiazapines (Xanax), and Alcohol.
You wish to be 95% confident and have an error of 0.4 mpg. The standard deviation is estimated at 1.8. How big must the sample be?
Preliminary results indicate that once a golfer has checked in, there is only at 20% chance that he or she will be a no-show. This chance of being a no-show can be modeled using the binomial distribution.
For each condition, 5 observations were collected (as provided). Show the final ANOVA table and interpret the 3 F ratios in terms of null/alternative hypotheses.
The project requires you forecast the historical data, replicating the appropriate trends, seasonalities, week-over-week variability, etc. Please refer to the chapter and materials on Forecasting for the procedures to do.
One flight daily to a certain destination. The following information shows the probability distribution of late arrivals for that flight in the past month:
Therefore the team needs a new arena. Determine whether the hypothesis test for this claim is left-tailed, right-tailed, or two-tailed.
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