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Suppose the random variable X has mean 45 and standard deviation of 15 and the random variable Y has mean 15 and standard deviation 3. What would be the mean and standard deviation of the random variable X + Y?
Mean 30, standard deviation 9
Mean 30, standard deviation 18
Mean 60, standard deviation 9
Mean 60, standard deviation 15.3
Mean 60, standard deviation 18
assume that a random sample is used to estimate a population proportion p. find the margin of error e that corresponds
a common mistake many statistics students make is saying we accept the null or prove the null instead of fail to
What is the probability that of today's 1,000 callers at least 5 received a busy signal? Use the poisson approximation to the binomial. (Round your answer to 4 decimal places.)
Test the overall significance of the regression model at α = .05 level. Please use the six-step hypothesis-testing framework we employed in class, and write out the last three steps in this table:
A survey found that the variance of the rental rates on 8 cars at the airport was 35.7 while the variance of the rental rates on 5 cars down town was 50.4. What test value should be used in a F test?
She takes a sample of 36 packages, and found that the mean weight is 3.01 pounds, with a standard deviation of .03 pounds. Determine a 95% confidence interval for the population mean.
Which measures of central tendency will always have but one (1) value for a set data?
find the lower amp upper limits of a confidence interval if the mean is eighteen percent and the margin of error is
How large a sample must be selected if the company wants to be 85% confident that the true mean differs from the sample mean by no more than 1 day?
a pharmaceutical company wanted to estimate the population mean of monthly sales for their 250 sales people. forty
Report a table of marginal means for each level of each of the three factors.
consider a company that selects employees for random drug tests. the company uses a computer to randomly select
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