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A local health center noted that in a sample of 400 patients 80 were referred to them by the local hospital.
a) Provide a 95% confidence level for all the patients who are referred to the health center by the hospital.
b) What size sample would be required to estimate the proportion of hospital referrals with a margin of error of 0.04 or less at 95% confidence?
Evaluate the result in part c with the decision using the expected value approach.
At 0.05 level of significance, is there evidence of significant relationship between age group and where people mainly get their news? If so, describe the relationship.
The probability that a bomber hits a target on a bombing mission is 0.700. Three bombers are sent to bomb a particular target.
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Calculate the expected value and standard deviation of the value.
State the appropriate set of hypothesis to test whether there is a relationship between the variables X and Y.
A sample of twenty automobiles was taken, and the miles per gallon (MPG), horsepower, and total weight were recorded. Develop a linear regression model to predict MPG using horsepower as the only independent variable. Develop another model with weig..
Banner Mattress and Furniture Company wishes to study the number of credit applications received per day for the last 300 days.
Statistical Hypothesis test for the given sample
Among the half that had surgery, 80% showed improvement after three months, but only 54% of those who used the wrist splints improved. what's the standard error of the difference in the two proportions?
95% confidence interval evaluate for proportion of Americans who believe Abraham Lincoln is United States' most outstanding President is 65% to 75%. If more precise estimate is requested, then confidence level.
Describe your answer to a person who has never had a course in statistics.
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