Confidence interval for shelf life
The shelf life of a particular type of battery is being studied. Twenty batteries are tested and the mean shelf life of the sample is Xbar=24.5 months. The estimated standard deviation is one month. Find a 95% confidence interval for shelf life
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Test the research hypothesis that men use the Internet more hours than women, set alpha at .05. Would your decision have been different if alpha were set at .01?
Draw the free-body diagram and write the corresponding elemental equation for a spring element with the following definitions.
The brightness of a television picture tube can be evaluated by measuring the amount of current required to achieve a particular brightness. A sample of 10 tubes results in an Xbar=317.2 microamps with a s=15.7. Find a 95% prediction interval for
An electron is released from rest at the negative plate of a parallel plate capacitor. The charge per unit area on each plate is = 1.7 x 10-7 C/m2, and the plates are separated by a distance of 2.2 x 10-2 m. How fast is the electron moving just be
Calculate the appropriate test statistic: What decision do we make? What this decision means in terms of this problem?
Displacement vector points due west and has a magnitude of 1 km. Displacement vector points due south and has a magnitude of 2.4 km. Find the magnitude and direction (relative to due east) of the resultant vector.
The inner surface of the cylinder is to be pressurized while the outer surface is not. what value of internal pressure would cause the cylinder to fracture (in the absense of any initial crack?)
Determine (a) the period and frequency of the motion, (b) the amplitude, (c) The maximum acceleration, (d) the position, velocity and acceleration at t= 2s, and (e) Plot a position vs. time graph for the oscillating motion and identify the point o
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