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What does a confidence interval tell us and why is it importance to use a confidence interval?
Determine the variance of X? (Illustrate your computation either in Table or in Equation form)
Find the critical t-value that corresponds to 90% confidence. Assume 90 degrees of freedom.
Automobiles arrive at the drive-through window at a post office at the rate of 4 every 10 minutes. The average service time is 2 minutes. the Poisson distribution is appropriate for the arrival rate and service times are exponentially distributed.
In a perfectly symmmetrical distribution: a) the range equals the interquartile range b) the interquartile range equals the mean c) the median equals the mean d) the variance equals the standard deviation
What sample size would be needed to estimate he population mean to within one-half standard deviation with 95% confidence?
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?
To estimate the mean of the population from sample information, we need to calculate the standard deviation of the distribution of the sample means around the population mean.
Pierre has a utility function for total asset position of u(x)=ln(x), His assets currently consist of $50,000 in cash and a rare violin he inherited from a rich uncle which is valued at $100,000.
Formulate this statement as a multiple regression model (form only, without parameter estimation).
Assuming that a difference (Δ) of 2 lbs. in the mean was important to detect, a maximum Type I Error (α) level of 5%, and the desire to run a two-tailed test, then:
Use expected collision claim amount to find out the collision insurance premium that would permit the company to break even on collision portion of policy.
Suppose a marketing research firm sends questionnaires to 10 different companies. Assuming that each company, independently of the others, returns its completed questionnaire with probability 0.40, what is the probability that 5 or less questionna..
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