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Let X represents the number of children (under 10 years old) in Australian households. The probability distribution of X is as follows:
Table 1
X 1 2 3 4 5 6
P(X) 0.2 0.25 0.25 0.17 0.1 0.03
What is the probability that a randomly selected Australian household will have:
(i) more than 2 children?
(ii) between 2 and 5 children, inclusive?
Find the probability that the number who consider themselves baseball fans is? (a) exactly? five, (b) at least? six, and? (c) less than four.
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Tell whether the sample size seems fairly large and, if not, whether it would be feasible to obtain a larger sample.
Test, at the 5% level of significance, whether the population standard deviation of hours spent studying is less than 10. Use the Critical value approach.
use a x2 test of association to test the claim that in the given contingency table the row variable and the column
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds. What is the value of the population mea..
It is able to adjust the standard deviation of the filling process. What would the standard deviation need to be so that no more than 2% of all filled bags weigh more than 52 kilograms?
The scores on a standardized mathematics test for 8th grade children in New York State form a normal distribution with a mean of u=70 and a standard deviation of o=10. a. What proportion of the students in the state have scores less than x=75?
Average time it takes males to complete a baccalaureate degree in the California public university system. Using the summary data below from the two samples, compute the value of the test statistic t*.
What proportion of American employees spends fewer than 15 minutes per day commuting?
Separately choose at random 2 of those under 21 to interview about attitudes toward alcohol. You have given every student at the party the same chance to be interviewed: what is that chance?
Dr. Jones, the history professor, administers a 30-item test the first day of class to ascertain his students' initial level of knowledge of American history
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