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Question: The observed risk of an accident per month at a busy intersection without any stoplights was 1%. The potential benefit of adding a stoplight was studied by using a computer simulation modeling the typical traffic flow for a month at that intersection. In 10,000 repetitions, a total of 50 simulated accidents occurred.
a. What is the estimated probability of an accident in a month at the intersection with a stoplight added?
b. Would adding the stoplight be a good idea? Explain.
Peggy wants to know if her pack of cookies was statistically different from those of the rest of the class. She found out the average number of chips per cookie this year was 13.82 and the standard deviation for the class was 7.25. She had a pack ..
The American dream has always been a staple of American culture. When people speak of it, they often refer back to the first half of the 20th century. Despite this, the American Dream is just as relevant to American culture today as it was in the ..
a random sample of 21 ncaa division i mens basketball games during the 2009-2010 season had an average attendance of
In the year 2006 the mean fare to fly from Charlotte, North Carolina, to Seattle, Washington, on a discount ticket was $267. A random sample of round-trip discount fares on this route last month gives:
We investigate if a period of time feels longer or shorter when people are bored compared to when they are not bored. Using independent samples, we obtain these estimates of the time period (in minutes):
at a batter testing facility if at least 2 of the 20 batteries tested indicate low voltage the entire lot will be
During 2007, sales of new, privately owned homes in the total United States and in the western states were broken down into price categories as follows: Source:
The mean daily amount of her tips was $24.85, with a standard deviation of $3.24. Can Ms. Brigden be 99% confident that she is earning an average of $20 or more per day in tips?
How many packages should be sampled in order to be 90% confident of being within 0.9% of the actual population percentage delivered damaged.
question a sample of 200 students in a stat class were asked how long did you sleep last night? the results are found
Waiting time is normally distributed. Calculate the value of the test statistic for your random sample rounded to two decimal places?
The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds.
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