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Many companies use sampling to determine whether a batch should be accepted. A (n, c) sampling plan consists of inspecting n randomly selected items from a batch and accepting the batch if c or fewer sampled items are defective. Suppose a company uses a (100, 5) sampling plan to determine whether a batch of 100,000 chips is acceptable.
a)What is the probability of rejecting a batch that has 3% defectives?
b)What is the probability of accepting a batch that has 9% defectives?
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.
Why do we do power calculations with single sample z test? A) Because we can use Z area tables to calculate the power. B) Because comparing a sample mean against a population mean is very powerful
Pretend you are in charge of a packaging equipment company that is filling boxes of cereal. From past experience we know the population's mean weight of the filled boxes is 300 grams (and we know the distribution of grams is approximately normal).
Find out the crude death rate, age specific death rate, standard death rate and adjusted death rate.
Can we conclude that car size is dependent on marital status? YES or NO (circle one)
We are interested in determining if the accident proportions differ between the two age groups:
Would it be reasonable to conclude that the population mean is 63 pounds?
Calculate the mean number and median number of apples in a bag.
The table given below shows joint probability distribution of X and Y . Determine the covariance between the X and Y ?
The chi-square goodness of fit test can be used when we:
The standard deviations s1 and s2 can be used when Ó1 and Ó2 are unknown and you believe that the underlying distribution is normal. Then, you would use s1 and s2 with the t-test for hypothesis testing.
Find the mean and standard deviation of X, the number of students in class, who will develop influenza.
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