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The time it takes a student to walk from the dorm to the chemistry lab follows roughtly a normal distribution with a mean of 20 minutes and a standard deviation of 3 minutes. how long does it take the slowest 10% of the students to walk from the dorms to the chemistry lab.
Find the probability using the Poisson distribution.
Their average age was 19.1 years with a standard deviation of 1.5 years. What is the 95% confidence interval for the population mean?
The mean SAT verbal score is 478, with a standard deviation of 98. Use the Empirical Rule to determine what percent of the scores lie between 380 and 478. (Assume the data set has a bell-shaped distribution)
What is the value of the standard error of the mean? What is the value of the confidence coefficient for a confidence interval with the indicated confidence level?
Find the least-squares regression line for predicting yield from planting rate and add this line to your plot. Choose the correct equation for the least-sqruares regression line.
Whether the suitable analysis would be one-tailed test or two-tailed test. A type I and type II error, given context of hypothesis.
The port of Trop can service only 1 ship at a time. However, there is mooring space for 3 more ships. Trop is a favorite port of call, but, if no mooring space is available the ships have to go to the next port.
Is this a proper probability density function? How do you know? Find the mean, variance, and standard deviation of x, showing your work.
The following data were obtained from an independent measures study. Determine if there is a significant difference between the treatments. Use a significant level of .01.
Using the method outlined in Brase and Brase, do the data indicate that the age group over 50 has a lower rate of hay fever?
5000 light bulbs each with an average life of 500 hours, standard deviation is 100 hours. Find the percentage of bulbs that can be expected to last between 540 hours and 780 hours.
Find the value for the correlation coefficient r.
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