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A random sample of 250 Ontario households using natural gas heating show that the mean monthly consumption of natural gas is 107.73 cu. ft., with a standard deviation of 13.94 cu. ft. Use these statistics to construct a 94% confidence interval for the mean monthly consumption for the population of all Ontario households.
Find out the slope, b, and the intercept, a, for the least-squares line. Write the equation of the least squares line.
By using significance level a = .05, and suppose a normal distribution what does evidence conclude?
At the end of 24 weeks of treatment, subjects were classified as responders or non-responders to treatment based on a battery of psychological tests.
Some television stations attempt to gauge public opinions by posing a question on the air and asking viewers to call to give their opinions.
What is the probability that more than 265 will be relieved of the nasal condition?
Suppose we estimate this model with OLS, and there is a correlation between unobserved student traits (in the error term) with attendance. How does this bias the coefficient of attendance?
What is the probability that a sample mean will be within plus-or-minus two of the population mean for each of the following sample sizes?
A researcher hypothesizes that individuals who listen to classical music will score differently from the general population on a test of spatial ability. On a standardized test of spatial ability, µ =58.A random sample of 14 individuals who listen..
LPP using the graphical method. Solveout the following linear programming problem utilizing the corner point method.
Fit a linear regression model for bp against sodium. Do you think this is a model with a good fit? Why?
Consider the following stemplot. The mean of the data represented in this stemplot ?
Can we conclude that the mean age of the population from which the sample may be presumed to have been drawn is less than 60 years? Let α = .05
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