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Why is the F-distribution important? How do you determine if a significant difference exists among the groups in ANOVA? How do you determine differences between the groups in ANOVA? Provide an ANOVA example using either a personal or professional experience.
What is an independent sample and what is a related sample? When should researchers use varying hypothesis tests for the different types of samples? Is one sample more appropriate to use than the other? Give an example of independent and related sample that can be used in your organization.
Why would you use the chi-square statistic? What type of data is used with chi-square analysis? Provide an explanation of a chi-square test of homogeneity and a chi-square test of independence.
When is a regression equation used? What terms describe the fit of a regression equation to the data? What is the importance of the coefficient of determination (r2)?
The following data represent the number of weed-eaters sold per month at a local garden shop and their prices
A random sample of 25 statistics examinations was taken. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is:
Plot stem-and-leaf plot and boxplot for Mtotal. Illustrate hand calculation of median location and upper hinge location of boxplot, and determine their corresponding data values.
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
If she performs 15 demonstrations this week, what is the probability of her being satisfactory? What is the probability of between 4 and 8 (inclusive) orders?
A researcher conducts some research in which they identify a significant positive correlation (r =0.42) between the number of children a person has and their life satisfaction. Which of the following is it inappropriate to conclude from this resea..
The probability of an randomly selected person quits a team is 0.125. Assume the team has n members. Determine the smallest n that the team needs to have if the probability of the team has at least 20 members left is 0.9.
Convert each of the following z intervals to x intervals.
Is it true that one of the major assumptions underlying ANOVA is that all the populations being studied in the experiment have the SAME distribution?
A group of 200 adults aged 21 to 50 were chosen from those entering Fit Right Health stores in Washington State, and were randomly divided in two groups.
When trucks arrive at the Ambassador Bridge, each truck must be checked by customs agents. The times are exponentially distributed with a service rate of 10 per hour. What is the probability that a truck requires more than 15 minutes to be checked..
The population of lengths of aluminium coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.20 inches. A sample of four metal sheets is randomly selected from a batch. What is the possibility that t..
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