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List two reasons it is better to sample without replacement when testing batches of products.When sampling without replacement,should you use the multiplication rule for independent or dependent events.
An analysis of variance was used to evaluate the mean differences from a repeated-measures research study. The results were reported as F(3,24)=6.40.
How would you explain the analysis of variance, assuming that your audience has not had a statistics class before?
Given the following sample information, test the hypothesis that the treatment means are equal at the .05 significance level. Complete an ANOVA table. State your decision regarding the null hypothesis.
Medical research team studied the ages of patient who had strokes caused by stress. Ages of 34 patients who suffered stress strokes. Create frequency distribution for these ages.
A random sample of 400 observations produced a sample proportion of 0.32. What is the standard error to construct a 99.5% confidence interval.
The standard deviations s1 and s2 can be used when Ó1 and Ó2 are unknown and you believe that the underlying distribution is normal. Then, you would use s1 and s2 with the t-test for hypothesis testing.
In a sample of 210 men, 35 prefer sugar free soft drinks. In a sample of 220 women, 42 prefer sugar free soft drinks. Using a significance level of 0.05, test whether women prefer sugar free drinks more than men. Calculate the p-value.
The useful life of an electrical component is exponentially distributed with a mean of 2500 hours. a. What is the probability the circuit will last more than 3,000 hours.
Based on the following results, is LIFO more effective in keeping the value of his inventory lower? Product FIFO LIFO. What is the null hypothesis?
In the North American court system, a defendant is assumed innocent until proven guilty. In an ideal world, we would expect that the truly innocent will always go free, whereas the truly guilty ones will always be convicted.
A unit for a telecommmunication system is to be designed so that the probability that it fails during a period of five years does not exceed 0.4. the unit is to be made up of (n) effectively identical componants each with an exponential failure di..
Based on the results of the test, can the consumer group report in its next publication that the tires last less than 60,000 miles?
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