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Product testers for a radio manufacturer routinely select a sample of units from the production line and test circuit integrity by subjecting each unit to extreme vibrations that are approximately triple the most violent shaking they are ever likely to encounter in the field. For the most recent five radios tested, the number of minutes until failure was found to be 15, 79, 68, 10, and 17 minutes.
Using the 0.05 level of significance, apply the Kolmogorov Smirnov test for normality in examining whether the population of failure times might be normally distributed.
It is claimed that 70% of the residents in a large town approve of the current zoning law. Four residents are to be randomly selected. Find the probability that:
The coefficient of determination explains (a) The amount of variation in the independent variable explained by the dependent variable;
Of 144 adults selected randomly from one town, 31 of them smoke. Construct a 99% confidence interval for the percentage of all adults in the town who smoke.
a particular variety of watermelon weighs on average 23.8 pounds with a standard deviation of 1.35 pounds. consider the
during the period of time that a local university takes phone-in registrations calls come in at the rate of one every
Use the Poisson Distribution the indicated probabilities in one year, there were 116 homicide deaths in Richmond VA. For a randomly selected day
when a survey calls residential telephone numbers at random only 36 of the calls reach a live person. you watch the
A particular bulb is turned on once each evening for an average of 10 hr. If it is desired to have a reliability of 90 percent, what is its design life in days?
Find the lower, middle, and upper quartiles of this data set. Also find the 10th, 15th, and 65th percentiles. What is the interquartile range?
Which of the following does not explain a possible relationship between variables when the null hypothesis is rejected?
For a large group of overseas passengers, the mean is 78 pounds and the standard deviation is 15 pounds. compute the relative dispersion of each group.
the weekly incomes of shift foreman for a given industry follow a normal probability distribution. with a mean of 1000
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