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A popular country singer has just released a new album. Assume that the number of album sales per day is normally distributed.
a. What two parameters of the distribution would you need to be able to determine the probability of sales on a particular day exceeding 100 units?
b. If the probability of sales exceeding 100 units is 20% and the mean daily sales is 86 units, then what is the standard deviation of the distribution?
Two warning systems. An airliner has two independent automatic systems that sound a warning if there is terrain ahead.
1. The president of State University wants to forecast student enrollment for Year 3. Using exponential smoothing with trend, the forecast for the current year (Year 1) is 20,000.
Find the probability that fewer than two cars will pass in exactly two of three consecutive intervals.
Microcomputer components. A staff analyst for a manufacturer of microcomputer components has compiled monthly data for the past 16 months on the value of industry production of processing units that use these components (X, in million dollars) and..
Suppose that you wanted to study children who have Down syndrome.- How might you use cluster sampling to obtain a probability sample of children with Down syndrome in your state?
Comment on the form, direction, and strength of the relationship in your scatterplot.
The number of vacation days taken by employees of a company is normally distributed with a mean of 14 days and a standard deviation of 3 days. For the next employee, what is the probability that the number of days of vacation taken is less than..
A random sample of 400 observations produced a sample proportion of 0.32. What is the standard error to construct a 99.5% confidence interval.
Use the argument forms presented in this section to structure the selections as specifically named arguments.- We cannot afford to close the library at Central Juvenile Hall.
A computer program reports that for a 2-by-3 ANOVA, with 15 observations in each group, MSA = 400, MSB = 200, MSINTER = 200, MSWG = 50. Perform the tests of no main effects and no interaction with α = .01.
Two quantities a and b are said to be in the "golden ratio" when the ratio of sum of the two quantities to the larger quantity equals
Compute a .95 confidence interval for the percentage of women in New York city who have seen the advert using equation (6.10)
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