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Question: Recall that the interquartile range covers the middle 50% of the data. For a bell-shaped population:
a. The interquartile range covers what range of standardized scores? In other words, what are the standardized scores for the lower and upper quartiles?
b. How many standard deviations are covered by the interquartile range?
c. The whiskers on a boxplot can extend a total of 2 interquartile ranges on either side of the median, which for a bell-shaped population is equal to the mean. (They can extend 1.5 IQR outside of the box but the distance between the median/mean and end of the box is an additional 0.5 IQR.) Beyond that range, data values are considered to be outliers. In other words, for bell shaped populations, data values are outliers if they are more than 2 IQRs away from the mean. At what percentiles (at the upper and lower ends) are data values considered to be outliers for bell-shaped populations?
A sample of 25 provided a sample mean x=14 and a sample standard deviation s = 4.32. What is the rejection rule using the critical value? What is the conclusion?
Watch an online presentation which relates to your field of study, or reflect upon a presentation which you have previously viewed, relating to your field of study. How does this presentation differ from others that you have heard? What can you le..
Two mating parts have critical dimensions x1 and x2 as shown below. Assume that x1 and x2 are normally distributed with means 1 and mean2 and standard deviations s1 = 0.400 and s2 = 0.300.
sparr investment inc. specializes in tax-deferred investment opportunities for its clients. recently sparr offered a
The selling price and size of a home for a suburb of Los Angeles in the year 1997 are shown in Table 6.6. At the time, even a small empty lot would cost.
A study of 102 patients who had digestive-tract surgery found that those who chewed a stick of gum for 15 minutes at mealtimes ended up being discharged after an average of 4.4 days in the hospital,- Determine and interpret the p-value for the test..
Problem based on combinatory - how many different license plates are possible?
Biology and Environmental Science Agway, a farm and garden supply store, sells winter fertilizer in 50-pound bags. What is probability that customer buy bags
Compute the time-average autocorrelation function. -- Compute the ensemble average autocorrelation function.
Suppose that he wishes to get out of the mine and that he does so by choosing one of the three doors uniformly at random and continues to do so until he is free. Find the generating function, the mean and the variance for the time it takes him to ..
Calculate the value based on this information. A new screening test for Lyme disease is developed for use in the general population. The sensitivity (ability to identify infected persons) is 60% and specificity (ability to identify non- infected p..
The mean weight of cereal in its 18 ounce boxes is less than 18 ounces. The computer display is shown below. Using a significance level of 0.05, what is your conclusion from these data?
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