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A new method of treatment is hypothesized to reduce the days patients are hospitalized after surgery. For a sample of 100 patients, the mean number of days of hospitalization is 5, with a standard deviation of 2.5. What is the 95% confidence limits for the mean?
To determine whether two categorical variables are independent, one should use the:
a car manufacturer claims that the miles per gallon for a certain model has a mean equal to 40.5 miles with a standard
suppose you are tasked to develop a section of the survey measuring home mortgage debt in which survey respondents are
a screw jack carries a 5 kn load. it has an m50 times 4 mm thread with a mean diameter of 47.4 mm. calculate the screw
Choose a variable. Before collecting the data, decide what a likely average might be, then complete the following: Write a brief statement of purpose of the study
Polls showed the two main candidates in the 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has margin of error less than 1%. Roughly how large a sample w..
We have no knowledge about whether waiting times follow a normal distribution. Why is it nevertheless appropriate to use inference methods which rely on the assumption of normality? Construct a 97% confidence interval for the true mean emergency wa..
assume that iq scores are normally distributed with a standard deviation of 15 points and a mean of 100 points. if 100
When 319 college students are arbitarily selected and surveyed, it is observed that 120 own a car. Determine a 99% confidence interval for true proportion of all college students who own a car.
someone working for a survey organization approached thefirst 100 students they saw on campus and noted that 52 of
Given the following frequency distribution, find out the mean, variance, and standard deviation.
Group suspects that local shopkeeper's 10g packs is actually less than wt. The group took sample of 40 whose mean wt is 9.95 and s.d. of 0.15. Find p-value for the test of hypothesis.
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