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Implantable heart pacemakers contain small circuit boards called substrates. These substrates are assembled, cut to shape, and fired. Some of the substrates will separate, or delaminate, making them useless. The purpose of this experiment was to study the effects of three factors on the rate of delamination. The factors were A: firing profile time, 8 versus 13 hours with the theory suggesting 13 hours is better; B: furnace airflow, low versus high, with theory suggesting high is better; and C: laser, old versus new, with theory suggesting new cutting lasers are better A large number of raw, assembled substrates are divided into sixteen groups. These sixteen groups are assigned at random to the eight factorlevel combinations of the three factors, two groups per combination. The substrates are then processed, and the response is the fraction of substrates that delaminate. Data from Todd Kerkow
Analyze these data to determine how the treatments affect delamination.
Do you think a sample of 25 is large enough to give them the margin of error they want? If not, how large a sample do you suggest they take?
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard deviation of $11.35.
If you assume returns follow a normal distribution, which investment would give a better chance of getting at least a $40 million return? Explain how your answer could change if you knew returns followed a skewed distribution instead of a normal d..
Airline company officials find that 86% of all people who make reservations show up for their flights. If an airline has accepted 240 reservations and if there are 213 available seats
A battery manufacturing plant normally operates two eight-hour shifts per day and 6 days per week. The manufacturer can produce 375 units per hour.
What scale is used to measure delivery performance? What kind of variable is delivery performance? Construct a frequency table for delivery performance for last month.
What is the probability the Time/CNN poll will provide a sample proportion within plus-or-minus 0.02 of the population proportion?
1 vitamin d is an essential ingredient for maintaining strong bones and teeth. sources of this vitamin are
What percentage of 25-year-old mean are over 6 feet 2 inches tall? What percentage of men in the 6-footer club are over 6 foot 5 inches?
you are picking a bouquet of 20 flowers for your mother at random from a garden with 25 coneflowers 35 daisies and 42
two-way anova between subjects anova is preformed when you havea. related samples in all cellsb. more than two level in
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