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Discuss the problem of finding a confidence interval for the difference µ1 - µ2 between the \wo means of two normal distributions if the variances uf and ""i are known but not necessarily equal.
For a constant matrix A and a Random vector z, E(Az)=AE(z), var (Az)=A var(z) AT under the Gauss-Markov conditions, determine the mean vector and the variance-co-variance matrix for the vector y-bar?( in terms of X, β, σ2)
question heights of men on a baseball team have a bell-shaped distribution with a mean of 177cm and a standard
the allowed fee for wedding services is 425. one ceremony provider is suspected of charging more than the allowed
The random variable x is known to be uniformly distributed between 70 and 90. The probability of x having a value between 80 to 95 is
Where S, A, and R are measured in dollars per week. Vanguard's marketing director is comfortable using parameter estimates that are statistically significant at the 10% level or better.
Observations was x ¯ = 119.8 (actually 119.7692), and the 14th observation, somewhat of an outlier, was 158. What is the value of x ¯ for the entire sample?
a psychologist has developed a new method designed to help people taking an exam. the method requires the person to
one environmental group did a study of recycling habits in a california community. it found that 73 of the aluminum
The possible responses to the question "How would you rate our quality of service?" with 1=excellent, 2=good, 3=fair, 4=poor, describes what type of variable?
The following table gives the number of U.S. families, in thousands, with pet dogs, pet cats, and pet birds, by size of family.
Find the probability of an untrained dog performing as well as Maggie. Is it unusual for an untrained dog to do as well as Maggie?
At 95% confidence using the critical value approach, test to see if the percentage of defective systems produced by x-Game has exceeded the industry standard.
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