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In a nationwide survey of 1000 companies with more than 50 employees, managers were asked to rank various factors that influence their decisions in hiring employees. Each factor was ranked on a scale of 1 to 10, with 1 being not important and 10 being very important. The factor "educational background" received a mean ranking of 7.2.
Is the sample mean of 7.2 exactly the same as the population mean?If another sample of 1000 companies is taken, do you expect the sample mean to be 7.2 again? Why or why not?Repeating this experiment many times with different samples, what values for the sample means would be possible? What values would repeat more often?
Consider the following two economic characteristics with two possible outcomes each: employment (increase, decrease) and economic trend (positive, negative).
A bank manager has developed a new system to reduce the time customers spend waiting for teller service during peak hours. The manager hopes that the new system will reduce waiting times from the current 9 to 10 minutes to less than 6 minutes.
As long as there is either an upward or downward trend in the data, will a k-period moving average have a smaller mean square error than a moving average obtained with k+1 periods? Why or why not?
Three coins are tossed simultaneously, consider the event E "Three heads or three tails" F " At least two heads" and G "Atmost two heads " of the pairs (E,F), (E,G) and (F,G), which are independent? Which are dependent?
Find out the probability that temperature of oven will range from 460 to 470 F?
The sum of two numbers is less then 27. The second number is 7 less then the first. What are the possible values for the first and second number
What's the probability that among three randomly selected high school students
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
Calculate the probability that the median of the sample or average medians is:
Given that a Brand A battery just failed, what is the expected value of the time we wait until the next Brand B failure?"
The producers of a new toothpaste claim that it prevents more cavities than other brands of toothepaste. A random of 60 people used the new toothpaste for 6 months.
A random variable is normally distributed, with (population mean)= 300 pounds and (standard deviation) = 50 pounds. How small can a simple random sample be if the standard error of the mean can be no more than 20 pounds?
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