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A city near a government weapons clean-up site is concerned about the level of radioactive byproducts in their water supply. The EPA limit on naturally occurring radiation is 5 picocuries per liter of water. A random sample of 26 water specimens from the city water supply gives y = 4.82 and s = 0.79. Does this provide sufficient evidence that the water supply is safe (i.e., below the maximum level allowed)? Test, using a = 0.01, and explain what your results mean.
a survey found that people who took coldeeze at the onset of a cold suffered on average 42 hours. what proportion of
according to nielsen media research the average number of hours of tv viewing per household per week in the united
what are sampling techniques and discuss about sampling techniques? write sources from where you have got the
Assume a normal distribution for pH values. If a random sample of 10 readings in a vat is taken and the mean pH is computed, find each of the following?
the waiting time for patients at local walk-in health clinic follows a normal distribution with a mean of 15 minutes
a chi-square test for goodness of fit is used in a situation with n 60 subjects distributed over three categories. the
according to some research males have better spatial skills than do females and according to other research females
What level of confidence is associated with an interval of .400513 to .515487 for the long run proportion of new product placements?
bags of a certain brand of tortilla chips claim to have a net weight of 16 ounces. net weights actually vary slightly
Describe the individuals and the variables in this study. Specify the quantitative and the categorical variables?Construct a stem-and-leaf display (or stemplot) of the distribution of the humerus lengths of the 59 male house sparrows.
given that fz 1radic2pie-z22 -infin lt z lt infin is the probability density function for the standard normal random
You want to prove that a population mean is not 7. Data is ratio and a large sample size will be used (n = 225). When the sample is done the sample mean is computed to be 7.2 and the sample standard deviation is 1.5.
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