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The distribution of cholesterol levels in teenage boys is approximately normal with mean = 170 and standard deviation = 30 (Source: U.S. National Center for Health Statistics). Levels above 200 warrant attention. Find the probability that a teenage boy has a cholesterol level greater than 200.
The finished subassembly two must be inspected. A list of activities, their predecessors, and their durations is given in the following Table.
A random sample of 36 cars showed a mean repair cost of $330, with a standard deviation of $120. What can you tell the city fathers?
The first and third quartiles were 17.95 and 35.45 miles per gallon, respectively, Develop a box plot and comment on the distribution. Is it a Symmetric distribution?
How long do new batteries last on a camping trip? A random sample of n1 = 42 small camp flashlights were installed with brand I batteries and left on until the batteries failed.
Populate the selected graph/frequency chart with fictitious data. Did your selected graph/frequency chart effectively portray the data?
With a 98% level of confidence a company producing street signs wants to make sure the length of their product is meeting quality standards.
If the population mean was $1047 in the previous year, does the evidence suggest that expenditure this year has significantly changed?
Find the probability that the mean amount of electric bills for a random sample of 75 households selected from this city will be between $132 and $136. Round to 4 decimal places.
Conduct a 3-period moving average, an exponential smoothing forecasting using an alpha of .25, and a seasonal forecast with 3 seasons.
The sample mean and the standard deviation were determined to be 120 and 40 respectively. The standard error of the mean is?
By contrast, the large retail grocery chains (Kroger, Safeway, etc.) that sell cereal make much smaller margins. What would explain this divergence in margins?
Identify whether it is an experiment or an observation study/survey. If experiment: identify experimental design, experimental units, factors & levels, response variable, and blocks (if any).
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