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Amoung all auto shops in San Antonio, a claim is made that the mean time needed to rotate the tires on a car is 16 mintues. A study of 20 auto shops revealed a mean time of 17 minutes with a sample standard deviation of 1.5 minutes. Can we conclude thatthe claim is justified?
The correlation between hours spent in the course and exam grades is .8. what percent f variation in exam grades can be explained by hours spent in the course?
find the values of t that bound the middle 0.8 of the distribution for df 25. give your answers correct to two decimal
a fair coin is tossed 500 times. find the probability of obtaining more than 300
the following hypotheses are given.h0 p .40h1 p ne .40a sample of 120 observations revealed that .30. at the .05
What is the probability that next years annual maximum negative return exceeds all previous negative returns? In other words, what is the probability that next years maximum negative return is a new record?
Standard deviations differ, and speculate on the possible meaning of these differences, presuming that they are representative of U.S. governors and large corporations' CEOs in general.
A retail store manager is trying to estimate the average purchase transaction amount for a particular store. She takes a sample of 35 transactions and determines the mean purchase transaction amount from this same is $85 with a standard deviation ..
The manufacturer then changes a manufacturing process and produces another batch and again measures the MTBF. Did the change to the process improve the MTBF?
What measure of central tendency is most sensitive to skewness and which is least sensitive? What are measures of central tendency used for? What are measures of dispersion used for?
A random sample of 70 printers discovered that a20 of them were being used in small businesses. Find the 99% limit for the population porportion of printers that are used in small businesses.
a brewerys filling machine is adjusted to fill bottles with a mean of 31.2 oz. of ale and a variance of 0.003.
Some authorities claim that globalization has led to greater income inequality in the U.S. and globally while others claim that inequality is due to improvements in technology and productivity. Using the Library and Internet sources, do the follow..
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