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1. The sample mean and sample variance of five data values are, respectively, x¯ = 104 and s2 = 16. If three of the data values are 102, 100, 105, what are the other two data values?
2. Suppose you are given the average pay of all working people in each of the 50 states of the United States.
(a) Do you think that the sample mean of the averages for the 50 states will equal the value given for the entire United States?
(b) If the answer to part (a) is no, explain what other information aside from just the 50 averages would be needed to determine the sample mean salary for the entire country. Also, explain how you would use the additional information to compute this quantity.
the deciles of any distribution are the points that mark off the lowest 10 and highest 10. on a density curve these are
What type of educational background do CEOs have? In one survey, 344 CEOs of medium and large companies were asked whether they had an MBA degree. There were 97 MBAs
Test the claim that the proportion of the people reporting imporvement was higher amoung the experimental treatment group than the control treatment. use z= 1.96.
Conduct a hypothesis test using H 0 : σ 2 = .009216 to see whether the sample data indicate that the variability in interest rates changed.
A person asks, "what do you think is the ideal number of children for a family to have?" The 497 females who responded had a median of 2, mean of 3.02, and a standard deviation of 1.81.
Construct frequency distribution tables for both the exports and imports data. Plot the frequency distributions on to one graph. Comment on your graphs.
a sample of 250 observations is selected from a normal population for which the population standard deviation is known
Below you are given a partial computer output based on a sample of 21 observations, relating an independent variable (x) and a dependent variable (y).
A student team in a business statistics course performed a factorial experiment to investigate the time required for pain-relief tablets to dissolver in a glass of water.
Develop a forecast of enrollment next semester using exponential smoothing with a a= 0.2. Assume that an initial forecast for the first semester was 120 (so the forecast and the actual were the same.)
Suppose that past data are not available for developing a planning value for p; therefore, you will use p = 0.050 for the planning average.
The economists in the Obama administration suggested that the stimulus package that they recommended in early 2008 would keep unemployment under eight percent.
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