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Quarters are currently minted with weights normally distributed and having a standard deviation of .061. New equipment is being tested in an attempt to impove quality by reducing variation. A simple random sample of 22 quarters is obtained from those manufactured with the new equipment, and this sample has a standard deviation of .041. Use a .05 significance level to test claims that quarters manufactured with the new equipment have weights with a standard deviation less than .061
The number of standard errors that the sample estimate (p 1 - p 2 ) of (p1 - p2) falls from its null hypothesis value of zero is called
Compute b1, slope of an OLS regression line using dollars spent as dependent variable (Y) and age as independent variable (X).
Engineers want to design seats in commercial aircraft so that they are wide enough to fit 98% of all males. (Accommodating 100% of males would require very wide seats that would be too expensive.)
Determine a 95% confidence interval for proportion of all voters in favour of candidate.
When the conditionally and unconditionally expected values of a discrete random variable would be different?
Summarize the relationship between sample size and confidence level.
Consider a random sample of size n from an exponential distribution, Xi ~ EXP(1,eta). a) Show that Q = X1:n - eta is a pivotal quantity and find its distribution.
Kind of examination produced significant main effects on both mean mark and time taken to complete the examination.
What is critical z-value which corresponds to confidence level of 88%.
What is the smallest level of significance at which you could reject the null in favor of the alternative hypothesis?
The director of admissions at Kinzua University in Nova Scotia estimated the distribution of student admissions for the fall semester on the basis of past experience.
For the last 18 review periods the average sales figure has dropped to $11,500 with a standard deviation of $4,000. Management is concerned. Perform a hypothesis test to determine if this change in sales is a potential problem.
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