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The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal having a mean of 266 days with a standard deviation of 16 days.
What is the lower and upper limit using the 1.5 x IQR rule for outliers.
a random sample of 64 students at a university showed an average age of 25 years and a sample standard deviation of 2
Graph the distribution using a histogram. Calculate the mean and standard deviation.
Is the Euro fair? Soon after the Euro was introduced as currency in Europe, it was widely reported that someone had spun a Euro coin 250 times and gotten heads 140 times. We wish to test a hypothesis about the fairness of spinning the coin.
Describe the sampling distribution of p-hat, the sample proportion of college students with the cell phones who send or receive the text messages with their phones.
Construct a 99% confident interval for the standard deviation of the amount of vitamin B6 per pill.
If Xbar is the sample mean diameter for a random sample of n = 16 rings, where is the sampling distribution of Xbar centered, and what is the standard deviation of the Xbar distribution?
Prediction equation is y^ = 30 + 0:60x. Determine predicted final exam score for student who has (i) midterm score = 100, (ii) midterm score = 50. Note that predicted nal exam score regresses toward mean.
consider a sequence of independent bernoulli trials with p0.28.a what is the expected number of trials to obtain the
Probability is 0.5% that home will suffer the 50% loss due to fire. If we ignore all other partial losses, what premium must insurance company charge for policy just to break even?
Registration process takes, on average, 2 minutes per patient. Among patients who get prescriptions, average time spent with doctor is 5 minutes. Among those admitted to hospital, average time is 30 minutes.
find the z value to the right of the mean so that 62.93 of the area under the distribution curve lies to the left of
The Complaints Department of a popular used car dealer receives most complaints about the electrical system, particularly the starter.
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