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Determine whether the given study is observational or experimental Label each of the following as an observational or experimental study. For the experimental study state the control group and treatment group.
a. A researcher finds that children whose parents smoke have more respiratory illness than children whose parents do not smoke have.
b. A teacher divides her class into two groups. One group is taught a lesson on the computer and the other is taught by traditional lecture. The teacher then gives a test to see that group has better grades.
Two letters are chosen at random without replacement from word statistical. Determine the probability that both letters are s?
Determine the probability that she lives in an all electric home?
A company makes camshafts. The camshaft lengths need to be within a certain tolerance or they will not fit. They have produced x bar and s charts
If true explain and if false give an example. a. The significance level of a statistical test is equal to the probability that the null hypothesis is true. b. If the significance level of a test is decreased, the power of the test would be expected t..
Calculate the suitable mean response time from both proposed locations and find out which proposed site must be selected for the new emergency facility.
The sales manager had predicted, before the business started, that year 1's sales would be 410 air conditioners. Using exponential smoothing with a weight of alpha = 0.30, develop forecasts for years 2 through 6.
Assume that the process is in control and that the population of all jar fills is normally distributed.
A study sponsored by American Express Co. and the French government tourist office found that old American stereotypes about French unfriendliness weren't true.
This model is fit to the data using the method of least squares using statistical software, and the following parameter estimates and their standard errors are obtained.
Describe the factors that might cause variation in weight of Tootsie Rolls during manufacture.
Determine percentage of employees has 5 dependents? Of all employees which have at least one dependent, determine percentage has more than one?
The correct set of hypotheses to test the effect of the bonus plan, the difference between the t and z distributions
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