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Q1) Researchers at pharmaceutical company have found that effective time duration of safe dosage of pain relief drug is normally distributed with mean two hours and standard deviation 0.3 hours. For what proportion of patients will drug be effective for between 2 and 2.25 hours?
In order to make little money for holidays, Farmer Fred is raising turkeys. Male of the species he has selected has mean weight of 17 pounds at maturity and standard deviation of 1.8 pounds. Weights are known to be normally distributed.
i) Determine the probability of randomly selected male turkey weights of at least 17.5 pounds at maturity?
ii) Determine the probability of random sample of 49 male turkeys having average of at least 17.5 pounds at maturity?
We are interested in determining if the accident proportions differ between the two age groups:
A local group claims that the police issue more than 60 speeding tickets a day in their area.
Test the claim that the mean age of the prison population in one city is less than 26 years. Sample data are summarized as n = 25, x = 24.4 years, and s = 9.2 years. Use a significance level of α = 0.05.
There were 3 defectives in the first batch and 5 in the second. Find a 95% confidence interval for the difference in the proportion of defectives.
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
A study group of long distance phone calls made from the corporate offices of Pepsi Bottling Group, Inc., in Somers, New York, revealed the length of the calls, in minutes, follows normal probability distribution.
Assume duration of human pregnancies follow mound-shaped distribution with mean of 266 days and the standard deviation of 16 days.
The function that defines the probability distribution of a continuous random variable is a?For a continuous random variable x, the probability density function f(x) represents.
Give a possible description why serum cholesterol values for older males are lower than for younger males and reverse is true for females.
Construct a 90 percent confidence interval for the true mean weight. Describe factors which might cause variation in the weight of Tootsie Rolls during manufacture.
Here is a scatterplot of average crawling age versus average outdoor temperature six months after birth followed by a plot of the residuals versus average outdoor temperature six months after birth.
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