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A new extended lightbulb has an average service life of 750 hours. With a standard deviation of 50 hours. If the service life of these bulbs approximates a normal distributions, about which percent of the bulbs will last between 600 hours and 900 hours?
1. a random sample of 26 offshore oil workers took part in a simulated escape exercise and their times sec to complete
What is the importance of the null hypothesis? Why has it been the backbone of mainstream hypothesis testing for decades? What are its limitations?
In terms of the standard scores for both sections, the score of which section was better? What are the z-scores for both sections?
the height of woman ages 20-29 is normally distributed with a mean of 64.4 inches. assuming the standard diviation
the manager of a video library would like the variance of the waiting times of the customers not to exceed 2.30
please illustrate positive correlation negative correlation and zero correlation with scatter
suppose that 67 of the employees of a company participate in the companys medical savings program. let x be the number
Record the type of research design used. True lab experiment, quasi-experiment, field experiment, or correlation design.
Find a 98% confidence interval for the mean number of days required for successful completion of physical therapy for patients in the average group. Discuss the results.
consider an arbitrary data set x1 y1 x2 y2...xn yn. let xbar and ybar denote the respective sample means for the
let x have normal distribution with mean 11.3 and standard deviation 5.7.find the cumulative probability of 9.31 or
a random sample of size 9 is collected from a normally distributed random variable. the sample mean is 6.507 and the
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