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Can you think of possible explanations for the observed relationship between use of nightlights and myopia, other than direct cause and effect? What additional information might help to provide an explanation?
Survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
let x and y be independent exponential random variables with respective parameters 2 and 3. find the cdf and density of
suppose a manufacturing company makes a certain item. the time to produce each item is normally distributed around a
In a random sample of 10 cell phone users, what is the probability that exactly 2 have used their phones to access the Internet? More than 2?
a certain length measurement is made with the following resultsreading 1 2 3 4 5 6 7 8 9 10x m 12.54 12.73 12.44 12.51
She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
The mean GMAT score of 65 applicants who were accepted into the MBA program of Xavier Business School was 520 with a standard deviation of 25. About how many applicants scored between 470 and 570 on the GMAT?
a market survey was conducted to estimate the proportion of homemakers who would recognize the brand name of a cleanser
At a significance level of 0.01, can you conclude that the mean times are different? Assume each population of relief times is normally distributed and that the population variances are equal.
Consider that 10 observations were selected from a normal population whose variance is 64. Observations are: 58, 62, 45, 50, 59, 65, 39, 40, 41 and 52.
What is the qualitative visible difference between the Ni nanowires (in ethylene glycol) that were exposed to ultrasound compared to those that were not? Describe what was observed.
The mean level of schooling for a population is 8 years and the standard deviation is 1 year. What is the probability that a randomly selected individual from the population will have had between 6 and 10 years of schooling? Less than 6 years or m..
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