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Suppose the Goodyear Tire Company developed two new brands of tires and would like to compare the variability of the tire life of the two. Both brands were driven under normal conditions, and random samples of the tires were collected. The following table shows the sample sizes and the standard deviations, in miles, calculated for each sample:
Brand 1 Brand 2
Sample standard deviation 5,300 3500
Sample Size 20 30
Using an alpha level 0f 0.01 determine if there is a difference in the varibility of the two tire brands.
Find the probability that among 9 randomly selected graduates, at least one finds a job in his or her chosen field within a year of graduating.
Assume that the distribution is normal. Based on empirical rule how many students scored between 51 and 79.
A sample of 10 urgent and non-urgent patients was conducted to determine average wait time. The hospital wants to be sure that urgent patients do not wait as long as non-urgent patients. The following hypotheses have been formulated.
List at least 3 qualitative attributes of the snack food about which they might want to ask consumers. Make sure at least one of them is nominal.
Which of the given experiments can be modelled by Poisson distribution?
Compute the Cumulative incidence of stroke in the study and compute the Cumulative incidence of stroke in patients classified as hypertensive at baseline
Gestational Age (Gestage, weeks) for sample of 100 low birth weight infants, and output from fitting a simple linear regression model to data, regressing Headcirc (Y) on Gestage (X).
heights of men on a baseball team have a bell shape distribution with a mean of 172cm and a standard deviation of 5cm.
a populations distribution is normal with a mean of 20 and a standard deviation of 5. a sample of 16 observations is
Make up a scatter diagram with 10 dots for each of the following situations:
Stock form a normal distribution with a mean of $8.52 with a standard deviation of 2.38. What percentage of the scores lie below $7.42?
a professor would like to utilize the normal distribution to assign grades such that 5 of students receive as. if the
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