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Jenn Bard, who lives in the San Francisco Bay area, commutes by car from home to work. She knows that it takes her an average of 28 minutes for this commute in the morning. However, due to the variability in the traffic situation every morning, the standard deviation of these commutes is 5 minutes. Jenn has to be at work by 8:30 A.M. every morning. By what time must she leave home in the morning so that she is late for work at most 1% of the time?
Prepare a power curve for this decision rule
Determine the area under the standard normal curve between z = 0 and z = 3. Determine the area under the standard normal curve to the right of z = 1. Determine the area under the stanard normal curve to the left of z = 1.5
Students in a statistics class at a large state university were given the survey in which one question asked was age (in years); one student was a retired person, and her age was an "outlier".
A teacher wants to know if students in her biology class did significantly better on an exam after instruction using authentic learning. The scores pre and post test are listed below. Based on an α = .05, what can the teacher conclude?
Use Hypothesis testing to determine if Dr. Boom is correct, that his sample of 25 rockets weight less than the average rocket.
The manufacturer of a computer terminal reports in its advertising that the mean life of the terminal, under normal use, is 6 years, with a standard deviation of 1.4 years.
Assume the population proportion is 0.17 and a simple random sample of 850 households will be selected from the population. What is the probability that the sample proportion will be within ±0.02 of the population proportion?
If we select one box of cereal at random from this population, what is the probability that it will weigh less than 915 grams?
The average age of the women was 36.97 with a standard deviation of 8.893. If a 95% confidence interval is calculated to estimate the difference between the two average ages, what is the margin of error? Assume both population standard deviations ..
Test hypothesis that both propellants have same mean burning rate. Utilize α=0.05. Compute the P value.
The final grades for a random sample of MKT 380 students are as follows: What is the standard deviation for these data?
These can have a large impact on tenure and promotion decisions at many institutions. One particular instructor had ratings in 3 courses in one semester as given by the table below for the statement "The instructor is an excellent teacher.
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