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The amount of fluid in a half-liter bottle of diet cola is normally distributed and, from past experiences the standard deviations known to be 1.20 milliliters (ml). A sample of 50 bottles reveals a mean weight of 502.1ml. Construct and interpret 90 percent on confidence interval for the mean. Be sure to interpret the meaning of this interval.
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
Form a frequency distribution and a percentage distribution that have class intervals with the upper class limits $99, $119, and so on.
Prepare the confidence interval of 95% for the welders' proportion that graduated in the school of welding.
For a population with a mean of μ = 60 and a standard deviation of σ = 24, find the Z score corresponding to each of the following samples.
The mean amount of time a (unnamed) computer server is down is 18.3 minutes with a standard deviation of 5.7 minutes.
Find out the probability that the return for common stocks will be more than 0%.
The variable recorded for each subject was the number of additional yards (possibly negative) that the subject could drive the ball by the end of the season. In the two-way ANOVA the DFM
In optimal solution, determine minimum time needed to complete project?
As it is a 2 × 2 table, try also two-tailed two-sample z test for π 1 = π 2 and verify that z 2 is same as your chi-square statistic. Which test do you prefer? Explain why?
Then explain your answer to someone who has never had course in statistics (but who is familiar with mean, standard deviation, and Z scores.)
At one excavation site 8641 pot shards have been found that not yet been cleaned and identified. What is the probability that:
Following data from an x bar chart, is the process capable (capability index>1.33)?
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