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A university has 10,000 students of which 45% are male and 55% are female. If a class of 30 students is chosen at random from the university population, find the mean and variance of the number of male students.
State the decision rule. Compute the pooled estimate of the population varaince. Compute the test statistic
Validity is more critical to measurement than reliability. A valid measurement is reliable, but a reliable measurement may not be valid.
John Rengel is the Quality Assurance Supervisor for Vino Supremo Vinyards. He knows that 10 percent of each box of corks is undersized.
Choose the proper conclusion regarding the claim that the population have different variances.
We would like to test if the proportion of respondents that support the health care bill is less than 50% (a) what kind of hypothesis test is appropriate?
The daily numbers of calls received by the Internal Revenue Service office in July are shown below:
If the mean lifetime of this type of component is 100 hours and its standard deviation is 19 hours, how many of these component must be in stock so that the probability of the system is in continual operations for the next 2,000 hours is at least ..
At least half the patients are under 15 years old? First, describe how this can be modelled as a binomial distribution with 8 trials, where success is visitor age is under 15 years old and the probability of success is 20 percent.
The old equipment? based on the results, does the new equipment appears to be effective in reducing the variation of the weights?
Prepare an ANOVA table and test the null hypothesis of no linear relationship between the two variables.
The heights of adults in one town have a mean of 66.3 inches and a standard deviation of 3.3 inches. What can you conclude from Chebychev's theorem about the percentage of adults in the town whose heights are between 59.7 and 72.9 inches..
Test the claim of the brewery about the mean volume equal to 32 oz. at the 0.05 significance level. It's your choice whether to use z or t.
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