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In a normally distributed data set with a mean of 22 and a standard deviation of 4.1, what percentage of the data would be between 17.9 and 26.1?
In 2008, there were 507 children in Arizona out of 32,601 who were diagnosed with Autism Spectrum Disorder (ASD) ("Autism and developmental," 2008).
What is the probability that the number of stomata for a randomly selected leaf is between 61 and 89?
Possible test scores ranged from 0 to 500. Assume that the scores are normally distributed. What is the probability that a student had a score higher than 315?
Hays Medical Center wants to estimate the percentage of adults who exercise at least 1 hour per week. How large a sample should be selected.
Assume the reliability of a product is given by an exponential distribution with a mean of 1 year. How long would it take to achieve a 10% failure rate?
While some teenagers received no allowance, others reported receiving $200 per week. Based on this information, the mean allowance for U.S. teenagers is most likely.
Read the report below and make judgments on the quality of random sampling for the study, using the scheme outlined above: (a) very well met
Using the 0.10 level of significance, apply the Kolmogorov-Smirnov test for normality in examining whether the scores could have come from a normally distributed population.
The publisher of Celebrity Living claims that the mean sales for personality magazines that feature people such as Angelina Jolie or Paris Hilton are 1.5 million copies per week.
According to the Sleep Foundation, the average night's sleep is 6.8 hours. Assume the standard deviation is 0.6 hours and the probability distribution is normal. a. What is the probability that a randomly selected person sleeps more than 8 hours?
the mean income per person in the united states is 37500 and the distribution of incomes follows a normal distribution.
Opportunity cost is 15%. What is the optimal replacement period: every 1, 2, 3, 4 or 5 years?
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