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According to the neilson company, the population mean number of hours of tv viewing per household per week in the us is 50.4 with a standard deviation of 11.8 hours. a random sample of 42 u.s household is taken for study.
a. What is the shape mean and standard deviation of the resulting distribution of the sample mean?
b. What is the probability that the mean of the sample of 42 is more than 52 hours?
c. What is the probability that a randomly selected household in the population watched more than 52 hours of tv in a week?
Appalachian Coal mining believes it can enhance labor productivity and therefore net revenue by reducing air pollution in its mines. It estimates that the marginal cost function for reducing pollution by installing additional capital equipment is.
A company has set a goal of developing a battery that lasts over 5 hours in continuous use in a sample of 42 of these batteries the mean life time was 306.25 hours with a standard deviation of 29.31
A university club consists of 4 men and 6 women. Two members are chosen at random without replacement. Let X = 0 if first person chosen is male, 1 if first person chosen is female. Y = 0 if second person chosen is male, 1 if second person chosen i..
The average number of typos on one page of a manuscript is 8. What is the probability that 4 to 6 type appear on 2 pages of the manuscript? Imagine Poisson distribution.
what percent of the total number of seeds germinated?
(a) Find the median cost of houses at Coal City in 1988. (b) Find the modal selling price of houses at Coal City in 1988.
The sampling distribution of mean score is approximately Normal. It has mean. What is its standard deviation?
Which measure of family wealth is most important, when making political decisions, the national mean, median or mode?
Are you doubtful of any of these data points? if so why does there show to be a linear relation between degree of stenosis and nuber of reactive nuclei?
What type of error has possibly been committed? Explain the error in ordinary language.
Which of given is the correct decision statement for test?
In a marketing study, 100 consumers were asked to select the best digital music player from the iPod, the iRiver, and the Magic Star MP3. To summarize the consumer responses with a frequency table, how many classes would the frequency table have?
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