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Yashchin (1995) discusses a process for the chemical etching of silicon wafers used in integrated circuits. This process etches the layer of silicon dioxide until the layer of metal beneath is reached. This company monitors the thickness of the silicon oxide layer because thicker layers require longer etching times. Historically, the layer of thicknesses have a standard deviation of 0.06 micron. Find the sample size required to estimate the true mean thickness to within ± 0.01 micron using a 95% confidence.
determine whether each of the distributions given below represents a probability distribution. justify your
In order to estimate the proportion of families who prefer female baby-sitters to male baby-sitters with an error of at most 8 percentage points and with at least 95 percent confidence, how large a sample should be taken?
A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it.
If the population standard deviation is σ = 10, can you conclude that the treatment has a significant effect? Use a two-tailed with α = .05.
Population standard deviation of 4 inches. For any one person selected at random, find out the probability that their height will be?
Find the probability that the mean weight of those loads is less than 42.00 tons. Assume that the variable is normally distributed.
if you sample 100 people and 20 turn out to be over 65 inches tall, you get $20. Which is better: a sample of size 100 or a sample of size 1,000? Choose one and explain. Does the law of averages relate to the answer you give?
British airways employs you as cunsultant to analyse the departure time of flight leaving Cape Town International Airport. The acceptance time frame for departures is 0 for on-time plus or minus 15 minutes. During a typical week the following flights..
Suppose that four American adults are asked if they ate at table-service restaurants last week. What is the probability that all of them say yes?
What is the mean and standard deviation of the flow time? What is the probability that the total time will be less than 920 seconds?
the distance between major cracks in a highway follows an exponential distribution with a mean of 5 miles.a what is the
Give an example representing a discrete probability distribution and another example representing a continuous probability distribution. Explain why your choices are discrete and continuous.
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