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One of DotCom's products has a width dimensional specification of 1.488 ± .005 inches. The process is in statistical control and the dimension is known to be normally distributed with mean μ=1.491 and standard deviation σ=0.004. The plan is to recenter the process so that the mean equals the target value. Evaluate this plan by comparing the fall out before recentering and after recentering. Fall out is the fraction of products that don't fall within specs.
Draw a sketch of the standard normal distribution curves, one for the current process and another one for the recentered process. Label the spec limits and shade the area of the curve that corresponds to your answer.
For a normal population with u. = 80 and a = 20 which of the following samples is least likely to be obtained?
The ages of cars owned by all employees of a large company have a bell shaped distribution with a mean of 8 years and a standard deviation of 2 years. Using the empirical rule, find the approx. percentage of cars (owned by those employees) that are b..
Suppose you know that the distribution of sample proportions of nonresidents in samples of 200 students is normal with a mean of 0.04 and a standard deviation of 0.03.
Use population distribution to determine expected juror frequencies. Test researcher's claim at a = 0.01.
The gambler is paid later as follows, depending on the number of winners he picked. What is his expected gain? Remember, a loss is a negative gain, and that the bookie keeps the gambler's $20.
From a previous study, the standard deviation of the ages is known to be 3 years.
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
The intelligence Quotient test scores normally distributed with a mean of 100 and a standard deviation of 15.
Multiple choice question based on multiple regression - The coefficient of determination for this model is
Find the mean ______________ and the standard deviation _____________
A researcher is comparing two antihypertensive drugs A and B with regards to reduction of patient's systolic blood pressure (SBP). Baseline SBP is measured for two groups of patients.
Create a 95% confidence interval for true mean.
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