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Degree of freedom, X^2 and F-tests
Q1: What the degree of freedom tells us?
Q2: What are the degree of freedom for t- test, X^2-test, and for F-twst?
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
"You are running a chi-squared test. If you have 5 groups with 3 characteristics each, what would your critical value be with an alpha of .25? a . Between 0 and 3.0
Under what situations on lambda1 and lambda2 will this system have the steady state distribution? Describe your answer.
If average size in square feet of homes built is 1810, determine maximum and minimum sizes of homes contractor must build. Suppose that standard deviations are 92 square feet.
For the following situation, assume the random variable is normally distributed and use a normal distribution or a t-distribution to construct a 90% confidence interval for the population mean. If convenient, use technology to construct the confid..
Choose the proper conclusion regarding the claim that the population have different variances.
According to the National Restaurant Association, 20% of fine-dining restaurants have instituted policies restricting the use of cell phones. From a sample of 100 fine-dining restaurants,
In studies examining the effect of humour on interpersonal attraction, McGee and Shevlin (2009) found that an individual's sense of humor had a significant effect on how the individual was perceived by others.
To report their finding they want to create a 90% confidence interval. What would be the margin error for this confidence interval?
Does this data provide evidence at the .05 significance level that there is a difference in the proportion of humorous ads in British versus American trade magazines? Please show work.
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?
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