Scores of a random sample
The scores of a random sample of 8 students on a physics test are as follows: 60, 62, 67, 69,70, 72, 75, and 78. Test to see if the sample mean is significantly different from 65 at .05 level. Report the t and p values.
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Thus, the population of production times is normal in shape. Find the mean and standard deviation of the sample. Assume an n=100.
A 1000 kg aircraft going 25 m/s collides with a 1500 kg aircraft that is parked and they stick together after the collision and are going 10 m/s after the collision. If they skid for 6.6 seconds before stopping, how far did they skid?
Olga owned a vacant lot that was zoned forresidential housing. She spent $900 in attorney fees to get theproperty rezoned as commercial. The property's valueincreased by $10,000 as a result of the rezoning.
Amos and his neighbor got into an argument overAmos's dog. The neighbor built a fence to keep the dog out ofhis yard. The fence added $1,500 to the value of Amos'sproperty.
A chair of weight 3.0 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 39.0 N directed at an angle of 40.0 below the horizontal and the chair slides along the floor. Please draw a picture for
If Y1 and Y2 are independent and identically distributed normal random varialbes with mean M(mu) and variance sigma^2, find the probability density function for U=(2/3)(Y1-2Y2+1).
Let X denote the length in minutes of a long-distance telephone conversation. Assume that the density for X is given by
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