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Calculate correlation coefficient for data below
x values -3 1 2y values 4 6 -2
solutions: a)-0.227 b)0.431 c)-0.454 d)-0.159
Compute the equation for regression line if n=7, Ex=69, Ey=528 Exy=4754 and Ex^2=825
solutions:
a)y'=-3.110+106.089xb) y'=-2.168+109.638xc) y'=109.638-2.168xd) y'=106.089-3.110x
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
11% of all books sold are romance genre. If the bookstore sells 316 books on a given day, what is the probability that fewer than 40 are romances, at least 25 are romances, between 25 and 40 are romances?
The height in inches of girls on a high school girls basketball team are as follows: Identify the z score used in a quantile plot for the player with a height of 66.5 inches.
The data below are the numbers of hours of homework done as reported by 24 high school juniors for the last week in September 2006.
If the alpha level is changed from a = .05 to a = .01, (a) What happens to the boundaries for the critical regions? (b) What happens to the probability of a type I error?
To conduct a follow-up study that would provide 95% confidence that the point estimate is correct to within plus-or-minus 0.04 of the population proportion, how large a sample size is required?
How is data screening related to the assumptions of the statistic you will choose to analyze your data?
In a column, write the sample space for the experiment that consists of observing the day's production.
If there is a negative dependent variable of -0.55, and independent variables Y1 of +0.75 and Y2 of -3.0, how do I interpret the relationships according to the signs?
A random sample of the lifetime of 49 UltraIllum light bulbs has a mean of 3,960 hours and a standard deviation of 200 hours. Construct a 95% confidence interval estimate of the mean lifetime for all UltraIllum light bulbs.
The random variable x, which is the number of occurrences of an event over an interval of ten minutes. It can be assumed that the probability of an occurrence is the same in any two time periods of an equal length.
Each salesperson at stiles compton is rated either below average, average, or above average with respect to sales ability. Each salesperson is also rated with respect to his or her potential for advancement.
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