Find the minimum sample size
McDonalds Waiting Times. You want to estimate SD for the population of waiting times at McDonald's drive up windows. You want to be 95% confident that the sample SD is within 20% of SD. Find the minimum sample size. Is this sample size practical?
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The starter motor runs for 0.75 s before the car engine starts up. How much electric charge passes through the starter motor? What is the current density in the wire?
The probability that a radish seed will germinate is 0.7. The gardner plants 140 seeds, what is the probability that she harvests less than 100 radishes. Use the normal curve approximation for bionomial distributions.
Calculate the standard deviation for the following sample, and show your work. Use the formula of your choice. Use the empty cells to facilitate your calculations.
Mrs. Smith's reading class can read an average of 175 words per minute with a standard deviation of 20 words per minute. Suppose that words per minute is approximately normally distributed. The top 4% of the class is to receive a special award. Wh
Find the maximum thermal efficiency of this heat engine (62.1%). Determine whether this engine can produce its desired power output (no).
Two parallel, infinite, nonconducting plates are 10.6 cm apart and have charge distributions of +2.5 µC/m2 and -2.5 µC/m2. What is the force on an electron in the space between the plates? (The charge of an electron is 1.602 10-19 C.)
Write down the pdf for each of the following distributions, then sketch the distributions on the axes provided (be sure to indicate which is which). a) N(2,9), b) N(0,1)
The distribution of the sum of independent N(?, ?2) random variables is:
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