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Compare population means or proportions to determine the relationship between variables.
a) Can only be used with independent samples.
b) Allow for testing procedures that eliminate some of the unrealistic assumptions required for testing by parametric measures.
c) Ignore individual measures, and, instead, focus on computed summary statistics of the populations being measured.
Suppose an appliance manufacturer is doing a regression analysis,using quarterly time-series data, of the factors affecting its sales of appliances.
Compute a 3 month moving average forecast of demand for April through January (of the next year). Compute a 5 month moving average forecast for June through January
All else being equal, what occurs to your confidence interval when you increase value of alpha?
A major study examined the relationship between cause of death (heart attack, cancer, stroke, accident, etc.) and age. A good way to graphically represent the relationship is with
Estimate the probability the store will gross over $850 a) Fewer than 5 out of 10 business days.
The following data represent the number of weed-eaters sold per month at a local garden shop and their prices
Suppose that population has normal distribution. Determine a 95 percent confidence interval for population standard deviation sigma.
A high school counselor is interested in the percentage of students who will be going to college. She randomly picks 60 students and finds that 53 will be going to college. Use a 95% confidence level to find the population proportion.
For patients over age 80, probability is 0.05 that coronary bypass patient will die soon after surgery, if hospital performs eight such operations, determine the probability of two or more fatalities?
Create a 90 percent confidence interval for the population proportion of all such firms with this as the primary motivation.
Must you assume that the population amount of paint per can is normally distributed here? Explain
If x is a binomial random variable where n = 100 and p = .1, find the possibility that x is less than or equal to 10 using the normal approximation to the binomial.
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