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Question: How might stratification be used in each of the following sampling problems?
a. A survey of household expenditures in a city.
b. A survey to examine the lead concentration in the soil in a large plot of land.
c. A survey to estimate the number of people who use elevators in a large building with a single bank of elevators.
d. A survey of programs on a television station, taken to estimate the proportion of time taken up by advertising on Monday through Friday from 6 P.M. until 10 P.M. Assume that 52 weeks of recorded broadcasts are available for analysis.
If the monthly demand for videos on average is 180 and standard deviation = 60, what is the number of videos the manager should order to meet 90% customer demand?
Statistics Questions Set: If the mean number of hours of television watched by teenagers per week is 12 with a standard deviation of 2 hours, what proportion of teenagers watch 16 to 18 hours of TV a week? (Assume a normal distribution.)
the texas corporation has four oil fieldsfour refineries andnbsp four distribution centers in the locations identified
On the same chart, produce a graph showing the original probability mass function, and a line graph showing your selected continuous probability density function.
An airline overbooks a flight, selling more tickets for the flight than there are seats on the plane (figuring that it's likely that some people won't show up).
Several complaints recently have been sent to the Gotham City police department regarding the increasing incidence of congestion on the city's streets.
Jot down whether each is male versus female, then use the runs test and the 0.05 level of significance in determining whether this sequence of customers might be other than random.
The managers in a company's East and West regions were rated on the basis of the company's evaluation system. A researcher wishes to conduct a t-test of means to determine if there is a difference between the East and West regions.
3 cards are randomly selected without replacement from an ordinary deck of 52 playing cards. Compute the conditional probability that the first card selected is a spade, given that the second and third cards are spades.
assume that bobs golf scores g approximately follow a normal distribution with a mean of 77and standard deviation of
A company produces scooters used by small businesses, such as pizza parlors, that find them convenient for making short deliveries.
Before every? flight, the pilot must verify that the total weight of the load is less than the maximum allowable load for the aircraft.
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