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A scientist studying babies born prematurely would like to obtain an estimate for the mean birth weight, U(mean) , of babies born during the 24th week of the gestation period. She plans to select a random sample of birth weights of such babies and use the mean of the sample to estimate U (mean) . Assuming that the population of birth weights of babies born during the 24th week has a standard deviation of 2.5 pounds, what is the minimum sample size needed for the scientist to be 95% confident that her estimate is within .5 pounds of U (mean)?
Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements).
Use normal approximation to determine probability that x = 2. Illustrate all work.
Based on the scenario, what is the appropriate analysis for examining differences among the Asking for Help subscale scores based on the number of online courses completed? Write an appropriate null hypothesis for this analysis
a survey asked business travelers if they worked harder on a business trip. fifty percent of the respondents were
Traveling Salesman Problem/Triangle Inequality) Consider a symmetric traveling salesman problem where the arc costs are nonnegative and satisfy the following triangle inequality:
Are X and Y independent?
Refer to the Journal of Information Science study of the relationship between the fraction y of documents retrieved using Medline and the number x of terms in the search query, Exercise 9.39. (p. 502)
Is there evidence to suggest that smoking causes a low birth weight? Test the claim at the 1% significance level and clearly state your conclusion. Follow all the test steps in hypothesis testing
A coin was flipped 60 times and came up heads 36 times. What is the critical value you would use to test whether the proportion of heads is greater than 0.50 at a 10% level of significance?
a normal distribution has a mean of 45 and an unknown standard deviation. which random variable value below could
Four different assembly processes were under consideration. Sixteen workers were randomly assigned to the four processes, eight per process. The number of correctly assembled units in an eight-hour work shift was recorded:
Setup Null and Alternate hypotheses to test if average amount of soda in each can is less than 32 oz. Test the hypothesis using a = 0.05. What can you conclude from all this?
As people use the toothpaste, the amount remaining in any tube is random. Assume the amount left in the ube follows a uniform distribution. How much toothpaste would you expect to be remaining in the tube.
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