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Which option produces the smallest risk of a Type I error?
1. α = .5 with n = 100 and σ = 10
2. α = .05 with n = 20 and σ = 10
3. α = .005 with n = 10 and σ = 10
4. The three other options all have the same risk.
Determine the probability that we would reject null hypothesis given that it is true?
According to a well-known newspaper journal, 58.3% of the 222,900 households in particular county get the Sunday edition of local newspaper. Assume that random samples of 200 households are selected.
Provide a brief description of the variable and whether the scale of measurement is nominal, ordinal, interval, or ratio, and why. Explain what it means to say that this variable is "normally distributed."
A faculty group wants to determine whether job rating (x) is a useful linear predictor of raise (y). Consequently, the group considered the linear regression model:
For a standard normal curve, find the z-score that separates the bottom 90% from the top 10%.
Find the most powerful predictor among the six independent variables using regression.
Use the F test of ANOVA (assume α = 0.05) to decide whether or not there are any differences in true average lumen outputs between the three brands for this type of light bulb.
If 16 measurements are taken and the standard deviation is 2.1 mg/dl is there enough evidence to support the claim that her standard deviation is greatear than the target at a = 0.01?
Find out point estimate and 95% confidence interval for mean family dental expenses of all employees of company.
In this research report you will be analysing a set of data of which can be found in an EXCEL file available for download in the Assessment section of the Blackboard site.
How does your sample compare to this theoretical distribution of sample means and what are the mean, variance, and standard deviation of the observations in your sample?
What is the probability that a randomly chosen employee is an Administrator if the employee has the opportunity of gaining promotion next year?
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