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Consider a regression study involving a dependent variable y, a quantitative independent variable x1, and a categorical independent variable with three possible levels (level 1, level 2, and level 3).
1) How many dummy variables are required to represent the categorical variable?
2.) Write a multiple regression equation relating x1 and the categorical variable to y.
3) Interpret the parameters in your regression equation.
assume you are a consultant to an hmo that is being evaluated on how well it improves the health status of its enrolled
The best we can do is to use one-way ANOVA and make sure to randomize the treatments to the experiment units. Why is such a randomization important?
find the number of chocolate chips a cookie should contain on the average if it is desired that the probability of a
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
normally distributed with a population mean of 2.5 and a population standard deviation of .5. Compute the following, showing all work: The percentage of students with GPA's above 3.0 is?
A health care analyst would like to know that if the duration of a given eye surgical procedure has a normal distribution with a mean of 240 minutes and a standard deviation of 40 minutes
The Central Limit Theorem states that the sampling distribution of means is:
If you were designing a study which group, a population or a sample, would you gather data from and why? Provide an explanation regarding whether or not the standard deviation is a biased or unbiased estimate.
a for a representative sample of cars would the correlation between the age of the car and its gasoline economy miles
Calculate the 95% confidence maximum error of estimate for a binomial experiment of 1027 trials that result in an observed proportion of .47.
determine the area under the standard normal curve in parts a through c below. find the area under the normal curve to
The time in hours required for 40 individuals to complete their federal income tax returns. Using past years' data, the population standard deviation can be assumed known with σ=9 hours.
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