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A tyre manufacturer found that the sample mean tread life of 49 radial tyres tested was 52345 km with standard deviation 12943 km. Construct a 99% confidence interval estimate for the true mean tread life of all radial tyres manufactured and give the upper limit.
Describe the advantages and disadvantages of quasi-experiments? What is the fundamental weakness of a quasi-experimental design? Why is it a weakness? Does its weakness always matter?
Assume the data are at least of interval scaling and compute the correlation between the American and Italian ratings. Assume the data are only of ordinal scaling and compute the correlation between ratings of the two cultures.
A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following
a control chart for fraction nonconforming indicates that the current process average is 0.03. the sample size is
a new over-the -counter cold medication includes a warning label stating that it may cause drowsiness. a researcher
the average tenure of technicians at abc company is 10 years with a standard deviation of 5 years. calculate the
A survey of 120 high school students shows that 39 of them work over 20 hours per week during the school year. Does it demonstrate the conjecture that more than 25% of the high school students work over 20 hours per week during the school year?
Determine the probability that a given cookie will have at least five raisins - Consider the cookies as trials in an experiment, and let X be the random variable which gives the number of raisins in a given cookie.
find the critical values for the indicated test for a population variance sample size n and the level of significance
If 9 measurements are randomly selected from this population, what is the probability that the sample mean will exceed 104?
a bicycle factory runs two assembly lines a and b. 97 of line as products pass inspection and 89 of line bs products
If the payoff of rolling two dice is the sum of the upper face of the two dice, what is the expected payoff of one roll of the two dice
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