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Face masks used by firefighters often fail by having their lenses fall out when exposed to very high temperatures. A manufacturer of face masks claims that for their masks the average temperature at which pop out occurs is 550°F. A sample of 75 masks are tested and the average temperature at which the lense popped out was 470°F. Based on this information is the manufacturer's claim valid?
a. Identify the population of interest to us in this problem.
b. Would an answer to the question posed involve estimation or testing a hypothesis?
Build a predictive model for number of calories using fat grams. If a pizza has 15 grams of fat, how many calories should it have, using your model?
What is the probability that none of the people are Independent? What is the probability that fewer than five people are Independent? What is the probability that more than two people are Independent?
Using the spreadsheet for exercises 1-3, estimate how the population will change from this generation to the next under each of the following conditions.
If 485 out of the next 500 orders are processed on the same day, would this prove that they are exceeding their goal, using α = .025?
A polling company obtains an alphabetical list of names of voters in a precinct. They select every 20th person from the list until a sample of 100 is obtained.
the increase or decrease in the price of a stock between the beginning and the end of a trading day is assumed to be a
What conclusions can you reach about the relationship between the battery capacity and the digital-mode talk time? You would expect the cell phones with higher battery capacity to have a higher talk time. Is this borne out by the data?
Identify a research question from your professional life, research interests, or everyday experience that could be addressed by this analysis.
a bank wishes to estimate the mean credit card balance owed by its customers. the population standard deviation is
a medical devices company wants to know the number of hours their mri machines are used per day. a previous study found
Why are the utilization statistics different across the different generating sources? What percent of total electric sales (in GWh) is nonresidential? Why are operating statistics like this useful to analysts?
What is the slope? What is the y-intercept? Is the line dashed or solid? Is the area shaded below or above the line?
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