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Suppose the total amount of "computer down-time" during the day (in seconds) at a certain company follows the normal distribution with a mean of 200 and standard deviation of 15. What is the conditional probability that the down time is longer than 236 days given that it is already longer than 227 days?
Births. Randomly selected births records were obtained and results are listed in the table below (based on data from the National Vital statistics Report,
The statistical analysis predicted that there would be 104 foxes. Calculate the residual for that data point.
Find the mean/standard error of the sampling distribution of the proportion. Assume that 26% of students at a university wear contact lenses. We randomly pick 300 students.
Standard deviation of 2.5 minutes. What does Chebyshev's Theorem say about the percentage of employees with commuting times between 58.6 minutes and 68.6 minutes?
A realtor took a random sample of records of sales of homes from the files maintained by the Albuquerque Board of Realtors.
The proportion of drivers who use seat belts depends on things like age, gender, ethnicity, and local law. As part of a broader study, investigators observed a random sample of 117 female hispanic drivers in Boston
Find the probability that the carbon monoxide concentration exceeds 9 ppm during a randomly selected one-hour period.
ample of fifteen 8 ounce Baby Ruth candy bars are weighed and it is found sample standard deviation is 0.6 ounces. Test company's claim at (alpha sign) is 0.05.
The grades of a sample of 5 students, selected from a large population, are given below. Determine a point estimate for the variance of the population.
Is the null hypothesis more likely to be rejected at alpha = 0.01 than alpha = 0.10? As the significance level increases to alpha = 0.10 from alpha = 0.01
A test indicates the presence of a particular disease 90% of the time when the disease is present and the presence of the disease 2% of the time when the disease is not present.
A random sample of 346 individuals is selected, and the individuals are classified according to their smoking habits and the smoking habits of their parents. The results are given in the contingency table below.
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