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A large manufacturing plant uses lightbulbs with lifetimes that are normally distributed with a mean of 1000 hours and a standard deviation of 50 hours. To minimize the number of bulbs that burn out during operating hours, all bulbs are replaced at once. How often should the bulbs be replaced so that no more than 1% burn out between replacement periods.
Briefly describe how the standard deviation influences the outcome of the hypothesis test. How does standard deviation influence measures of effect size?
At the .01 significance level, is there a difference in the mean number of times men and Women order take-out dinners in a month? What is the p -value?
The population are shorter than 66 inches, what is the probability a randomly selected member of this population is between 66 and 76 inches tall?
You are reviewing a scientific study where the epidemiologists sampled 1000 people from Charleston, South Carolina and measured variation at two loci, A and B.
question a property manager thinks that the average rent for one-bed room flat his city has gone up to aed 6000 per
State the Null Hypothesis and the Alternative Hypothesis
The lengths of pregnancies are normally distributed with a mean of 264 days and a standard deviation of 25 days. If 100 women are randomly selected, find the probability that they have a mean pregnancy between 264 days and 266 days.
a survey of 131 investment managers in barrons big money poll revealed the followingbull 43 of managers classified
What signified to you on all of the problems that required a binomial distribution that you were to use a binomial distribution? Which problems required a binomial distribution?
A sample of approx 25 students enrolled in the university points out that X (bar) = $315.4 and s = $43.20.
Over the past few years the percentage of students who leave Lakeland College at the endof the first year has increased. Last year Lakeland started a voluntary one-week orientationprogram to help first-year students adjust to campus life.
A random sample of 100 pumpkins is obtained and the mean circumference is found to be 40.5 cm. Assuming that the population standard deviation is known to be 1.6 cm, use a 0.05 significance level to test the claim that the mean circumference of all p..
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