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Suppose that from the past experience a professor knows that the test score of a student taking his final examination is a random variable with mean 68 and standard deviation 9.5. How many students would have to take the examination to ensure, with probability at least 0.94, that the class average would be within 2 of 68?
sven hendriksson finds that one of his productivity measures is related to the number of employees e and the production
Find the variance and standard deviation for the two distributions above. Compare the variation of the data sets. Decide if one data set is more variable than the other.
one sample of n 8 scores has a variance of s2 6 and a second sample of n 8 scores has s2 10. if the pooled variance
In testing a new drug, researchers found that 6% of all patients using it will have a mild side effect. a random sample of 11 patients using the drug is selected. find the probability that exactly two will have this mild side effect.
Find a 95% confidence interval for the true proportion of voters who approve of the way the government is being run.
Indicate which would be the independent variable and which would be the dependent variable in each of the following:
a) Set up the null and alternative hypotheses, and perform the hypothesis test. b) Does the jury selection system appear to be fair?
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
Determine the coefficient of correlation between the two variables. Interpret the value.
in a one-tail hypothesis test where you reject h0 only in the upper tail and the p-value is .0228 assuming zstate 2.00
A California lawyer practices law, on the average, for 30 years. Assuming these members remain steady, how many lawyers would you expect California to have in 2050.
The weight for a group of 18 month-0ld girls are normally distributed with a mean of 24.4 pounds and a standard deviation of 2.6 pounds. Use the table to find the percentage of 18 month-old girls who weigh more than 27.8 pounds.
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