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A certain type of digital camera comes in either a 3-megapixel version or a 4-megapixel version. A camera store has received a shipment of 18 of these cameras, of which 7 have 3-megapixel resolution. Suppose that 5 of these cameras are randomly selected to be stored behind the counter, the other 13 are placed in a storeroom Let X = the number of 3-megapixel cameras among the 5 selected for behind the counter storage.
(a) Compute P(X = 3).
(b) Compute P(X > 3).
(c) Calculate the mean of X.
(d) Calculate the standard deviation of X.
Suppose that the arterial diastolic blood pressure readings in a population follow a normal probability distribution with mean 80 mm Hg and standard deviation 6.2 mm Hg.
We will test to determine if there evidence of an improvement on the final examination, at the 1% significance level. What is the alternate hypothesis?
The local municipality claims that since the percentage of intersections that had an accident last year decreased from the prior year, the city is now safer. What are the hypotheses for this situation? Is the city really safer?
Give a real world example of a situation where normal parametric tests would not be useful and where there is a need for nonparametric test methods. Be specific and explain why nonparametric tests are needed in that case.
The lead time is 2 weeks.If you were asked to create an (R,s,S) policy for this, what parameters would you pick? Give your reasons.
if we are testing for the difference between the means of 2 related populations with samples of n1 30 and n2 30 the
late payment of medical claims can add to the cost of health care. an article reported that the mean time from the date
A voltmeter is used to measure a known voltage of 100 V. Forty percent of the readings are within 0.5 V of the true value. Estimate the standard deviation for the meter.
A least squares linear trend line is just a simple regression line with the independent variable being time (months or years for example).
a researcher conducts a study of white and black attitudes toward the police in her community.the percentage of white
name two ways to increase the statistical power of an experiment. explain how each increases the probability of
Number of days of accrued annual leave. suppose that the mean and variance are 12 and 144, respectively. What is the probability that a sample of size 100 will yield a mean greater than 9?
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