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For a continuous random variable x, the probability density function f(x) represents
a. the probability at a given value of xb. the area under the curve at xc. Both the probability at a given value of x and the area under the curve at x are correct answers.d. the height of the function at x
Each organization gets a 90% confidence interval. About how many of these intervals should cover the population average?
Suppose we wish to predict the crawling age of a particular baby when the average outdoor temperature is 25°F six months after birth.
Out of 1000 people surveyed, 600 belonged to urban areas and rest to rural areas. Among 500 who visited other states , 400 belonged to urban areas. Test 5 % level of significance whether area and visiting other state are dependent.
At 5% level of significance, does this sample prove violation of guideline that average patient must pay no more than $250 out of pocket?
The average salary for graduates entering the actuarial field is $40,000. If the salaries are normally distributed with a standard deviation of $5,000, find the probability that An individual graduate will have a salary over $45,000.
She asks 10 people how many Standard Deviations songs they know. Her data are:
You choose random sample of 50 cans, and mean amount of paint per 1-gallon can is 0.995 gallon. Is there evidence that mean amount is different from 1.0 gallon (use α=0.01).
The superintendent of a printing plant has selected a random sample of 100 rolls of paper from a large shipment. The average length of the sample rolls is 416 feet, with a variance of 2704 feet.
At the .01 significance level, is the mean grade of the women higher than that of the men? Set up the 5-step hypothesis testing procedure and solve.
Suppose a random sample of 50 architects and engineers is selected. How likely is it that the random sample contain five or fewer women in these positions.
Would you prefer to have your college or university run on the order of the medieval University of Bologna? Why or why not? In what ways is your college or university indebted to the medieval university?
Percentage points in either direction from what would have been obtained by interviewing all voters in the United States." Find the sample size suggested by this statement.
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