Confidence interval for the standard deviation
Find the 95% confidence interval for the standard deviation of the heights of maple trees if a sample of 23 trees has a standard deviation of 12 feet.
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A study was conducted to determine the mean amount spent on birthday gifts for a typical family having two children. A sample of 145 was taken, and the mean amount spent was $187.75.
Determine the maximum error of the estimate, E. Determine the confidence level used for the given confidence interval.
In a sample of 45 mice, a biologist found that 46% were able to run a maze in 30 seconds or less. Find the 99% limit for the population proportion of mice who can run that maze in 30 seconds or less.
Let a sub n be the number of ways of coloring the sectors using four colors (Blue, Green, Red, Yellow) so that no two adjacent sectors have same color. Determine and solve a recursion formula for {a sub n}.
Take any location (n,k) in Pascal's triangle, and consider the six locations immediately surrounding (n, k). Label these locations alternately clockwise A and B. Prove that the product of the binomial coefficients at the three A locations equals t
A person upon earth notices rocket approaching from the right at speed of 0.77c and another rocket approaching from the left at 0.56c. Determine the relative speed between the two rockets, as measured by a passenger on one of them?
Galaxy A is moving away from us with speed of 0.70c relative to earth. Galaxy B is moving away from us in opposite direction with a relative speed of 0.50c. Suppose that the earth and the galaxies are moving at constant velocities, so they're iner
After the launch, an observer upon earth sees the spacecraft approaching at a speed of 0.50c and exploration vehicle approaching at speed of 0.65c. Determine the speed of the exploration vehicle relative to the spaceship?
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