Confidence interval for mean weight per brown gerbils
A study of 35 brown gerbils showed that their average weight was 4.7 ounces. The standard deviation of the population is 0.7 ounces. Which of the following is the 99% confidence interval for the mean weight per brown gerbils?
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On the basis of this information, make an inference about customer reaction to the new policy. (Round your answers to 2 decimal places. Omit the "%" sign in your response.)
The fracture strength of tempered glass averages 14 (measured in thousands of pounds per square inch) and has standard deviation 2. What is the probability that the average fracture strength of 100 randomly selected pieces of this class exceeds 14.
Resistors to be used in a circuit have average resistance 200 ohms and standard deviation 10 ohms. Suppose 25 of these resistors are randomly selected to be used in a circuit. What is the probability that the average resistance for the 25 resistors
A machine is shut down for repairs if a random sample of 100 items selected from the daily output of the machine reveals at leas 15 percent defectives.
A random sample is selected from a normal population. The population mean is μ=60 and the population standard deviation is α=15. After a treatment is given to the members of the sample, the sample mean is M=65. The sample size is n=25.
An urn contains ten balls numbered 1 through 10. Five balls are drawn at random and without replacement. Let A be the event that exactly two odd-numbered balls are drawn and they occur on odd-numbered draws from the urn. What is the probability of
If its number is not a prime number, a second urn is selected from the remaining four and the experiment receives the total amount in the two urns selected. What is the probability that the experiment ends up with exactly twenty-five dollars?
Which approach, naïve or exponential smoothing with alpha =.2, would have produced the greater accuracy had it been used for forecasting? Use a start forecast of 14 for the first Monday for exponential smoothing.
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