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Two machines are supposed to be producing steel bars of approximately the same length. A sample of 35 bars from one machine has an average length of 37.013 inches, with a standard deviation of 0.095 inches. For 38 bars produced by the other machine, the corresponding figures are 36.974 inches and 0.032 inches.
Using the 0.05 level of significance, test the null hypothesis that the population means are equal. Using the appropriate statistical table, what is the approximate p-value for this test?
Construct and interpret the 95% confidence interval for the difference between the population means.
If the pairing is done at random, what is the probability that there are no white-black roommate pairs?
The primary objective of many control systems is to maintain the output variable at the desired or reference condition when the system is subjected to a disturbance [22]. A typical chemical reactor control scheme is shown in Figure P9.17.
For the system described in Problem P10.13, the goal is to achieve a phase margin of 50° with the additional requirement that the time to settle (to within 2% of the final value) be less than 4 seconds. Design a lead network to meet the specifica..
in the june 2007 issue consumer reports examined top laoding and front loading washing machines testing samples of
the rockwell hardness of a metal is determined by impressing a hardened point into the surface of the metal and then
describing distribution the reaction times of 500 randomly selected drivers measured under standard conditions.a. how
Calculate the number of classes and class width. Construct a frequency distribution, including the relative frequency. Construct a histogram or bar graph (depending on your answer to part a), including all labels.
It is said that happy and healthy workers are efficient and productive. A company that manufactures exercising machines wanted to know the percentage of large companies that provide on site health club facilities. A sample of 240 such companies s..
a doctor studies the side effects of a drug on a male and female. following data was obtained for a random sample of
Inventories represent a considerable investment for every organization; thus, it is important that they be managed well. Excess inventories can indicate poor financial and operational management.
What figures do you need to calculate for this test? How many degrees of freedom are there? What is the value of the chi-square statistic for this table? What is the p-value of this statistic
It appears that people who are mildly obese are less active than leaner people. One study looked at the average number of minutes per day that people spend standing or walking.
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