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A company is studying the number of monthly absences among its 125 employees. The following probability distribution shows the likelihood that people were absent 0, 3, 4, 6, 8, or 11 days last month. Number of days absent Probability 0 0.51 3 0.24 4 0.13 6 0.06 8 0.06 11 0 What is the variance of the number of days absent? 2.96 5.91 11.83 4.91
What would be the most appropriate graphical representation to show the dispersion of new home prices in a particular area? Why?
A normal distribution with a mean of 55 and a standard deviation of 6 is evaluated to solve a business problem.
Post a message in the Discussion area that answers the following question. Do you think the person has ESP or can their success ratio be attributed to chance variation?
Convert Alisha's grandmother's score to a z score among the distribution of exercise capacity in Americans over seventy years old. Who has a relatively longer exercise capacity compared to her peers-Alisha or her grandmother?
Sun Love grapefruit growers have determined that the diameters of their grapefruits are normally distrubuted with a mean of 4.5 inches and a standard deviation of 0.3 inches.
A random sample of 90 printers discovered that 25 of them were being used in small businesses. Find the 95% limit for the population proportion of printers that are used in small buisnesses.
an investigator conducts a study to investigate whether there is a difference in mean pef in children with chronic
Consider the experiment of rolling a pair of dice. Suppose that we are interested in the sum of the face values showing on the dice.
SAT verbal scores are normally distributed with a mean of 423 and a standard deviation of 91. Use the Empirical Rule to determine what percent of the scores lies between 423 and 514.
What must be checked in order to compare two population means when you do not know the values of the population standard deviation? Which one?
A manufacturer claims that fewer than 6% of its fax machines are defective. In a random sample of 97 such fax machines, 4% are defective. Find the P-value for a test of the manufacturer's claim.
assume that iq scores are normally distributed with a standard deviation of 19 points and a mean of 100 points. if 65
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