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The typical amount of sleep per night for undergraduate college students has a bell shaped distribution with a mean of 6 and a standard deviation of 1.60 hours. Based on this distributional information we can conclude that at least 95 % of this population sleep between______ and ________ hours per night.
It has been determined that the mean life is 1000 hours and the standard deviation is 50 hours. It can be concluded that at least 89% of the bulbs will last between?
A marketing research firm wishes to estimate the proportion of adults who are planning to buy a new car in the next 6 months. A simple random sample of 100 adults led to 22 who were planning to buy a new car in the next 6 months.
How large of a sample would be necessary if no estimate were available for the proportion that support current policy?
Other questions we might want to ask about pooling similar populations: Do all the subpopulations have the same ratio of yellow to green seeds? Does the average ratio deviate from our hypothesized ratio?
question records on a fleet of trucks reveal that the average life of a set of spark plugs is normally distributed
Is there a method which is accepted across industries for determining the minimum size of valid sample? N>50 +(8m aka 8 times the number of independent variables)
every year the cdc conducts phone surveys to assess the health risks of people in the u.s. this survey is abbreviated
major league baseball salaries averaged 3.26 million with a standard deviation of 1.2 million in 2013. suppose a sample
Use appropriate Excel functions to solve the following questions: Compute the probability of receiving four calls in a five-minute interval of time.
1. give examples of two variables that are positively correlated and two that are negatively correlated.2. what
One normal curve has mean 23 and standard deviation 1, a second normal curve has mean 5 and standard deviation 10. The curve that is more dispersed, or spread out, is
the heights of 18-year-old men are normally distributed with a mean of 68 inches and a standard deviation of 3 inches.
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