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Question: Length of pregnancies
The length of human pregnancies from conception to birth varies according to a distribution that is approximately Normal with mean 266 days and standard deviation 16 days.
a) What percent of pregnancies last fewer than 240 days (that's about 8 months)?
b) What percent of pregnancies last between 240 and 270 days (roughly between 8 and 9 months)?
c) How long do the longest 25% of pregnancies last?
Suppose a worker needs to process 400 items. The time to process each item is exponentially distributed with a mean of 2 minutes, and the processing times are independent.
You perform a one sample mean hypothesis test on a random sample of data and observe a p-value of 0.2157. What is the appropriate conclusion? Conclude at the 5% level of significance.
At the .025 significance level, can we conclude that less than 88 percent of the orders are delivered in less than 10 minutes?
Flu cases this past fly season in the Central City school system were about 15 per week. For the entire state, the weekly average is 16 and the standard deviation, 2.35. Are the kids in Central City as sick as the kids throughout the state?
What is sampling with replacement, and why it is used?
Random samples of 2009 pickup trucks with 4 cylinder, 5 cylinder, 6 cylinder, and 8 cylinder engines were obtained. Each pickup truck was tested for miles per gallons in highway driving
Do you support Bob's claim that citizens in his area spend more than $75 per year? Explain why or why not. Find a 95% confidence interval for the true mean amount that citizens spend per year.
A survey of the number of calls received by a sample of Southern Phone Company subscribers last week revealed the following information.
Develop a probability tree showing all marginal, conditional, and joint probabilities and what is the probability that a student selected at random failed the test?
The thickness of metal plates made by a particular machine are normally distributed with mean of 4.3 mm and standard deviation of .0.12 mm. What is the value of c for which there is 80% probability that a metal plate has a thickness with in the in..
The possible responses to the question "How would you rate our quality of service?" with 1=excellent, 2=good, 3=fair, 4=poor, describes what type of variable?
The number of runs with respect to the sample median is:
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