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Lifetimes of a certain brand of light bulb have a mean and standard deviation of 100 hours. Suppose that your company owns a warehouse that contains 50 of these bulbs. (a) Using the Central Limit Theorem, what is the approximate distribution of sample average lifetime for the bulbs in the warehouse? (b) What is the probability that the average lifetime exceeds 120 hours? (c) Explain why you cannot use the CLT to determine the probability that a single light bulb lasts over 120 hours. (d) Could you use the CLT to approximate the distribution of the total lifetime of these bulbs?
The number of traffic accidents that occurs on particular stretch roas during a month follows a Poisson distribution with mean of 8.5. Find the probability of observing exactly three accidents of this stretch of road next month.
Provide two examples for each source of measurement error and include how each example might likely influence research results.
The systolic blood pressure of a group of 18-year-old women is basically distributed with a mean of 120 mmHg and a standard deviation of 12 mmHg.
Compute the effect size for each of the following average SAT math scores. Remember SAT math is standardized such that u= 500 and standard deviation =100.
What is the difference between evaluation and simplification of an expression? How does a term differ from a factor?
The mean salary for engineers with less than 5 years' experience is $60,000 with a standard deviation of $5,000. Compute the z values for both 1)Rob and 2)Rachel.
A recent study was designed to compare smoking habits of young women with those of young men. A random sample of 150 women revealed that 45 of them smoked.
At α = 0.01 level of significance, test the hypothesis that these data can be described by a Poisson pdf.
Random number generation based on discrete distribution and evaluate the average queue length, waiting time, and percentage utilization for each system.
You do not need to collect data and actually conduct the test calculations. Rather,state the claim, define the null and alternate hypotheses, identify the test significance and the test statistic, and state the decision rule that will be used.
While in Paymor Hospital such exams were given in 110 out of 200 cases. In a left-tailed test for equality of proportions, the p-value is?
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
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