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1- The signs on an elevator states "Maximum Capacity 1,140 Kilogram" or 16 persons". If the mean weight is 75 kilos and the standard deviation of the weight is 10 kilos,
What is the probability that a sample of 16 persons would weigh more than 1140 kilos.
2- A factory's worker productivity is normally distributed. One worker (worker 1) produces an average of 75 units per day with a standard deviation of 20. Another worker (worker 2) produces at an average rate of 65 per day with a standard deviation of 21. What is the probability that during one week (5 working days) worker 1 will produce more than worker 2?
3- The long-distance calls made by the employees ofa company are normally distributed with a mean of 6.3 minutes and a standard deviation of 2.2 minutes. How long do the longest 10% of calls last
4- A certain type of tomato seed germinates 90% of the time. A backyard farmer planted 25 seeds.
a. What is the probability that exactly 20 germinate?
b. What is the probability that 20 or more germinate?
If 1st wave of such 5000 emails were sent to the target age group in Hang Road region, What is the probability that 1750 or fewer people will respond and switch their credit card?
Our bodies have a natural electrical field that is known to help wounds heal. Does changing the field strength slow healing? A series of experiments with newts investigated this question.
Running a study comparing 3 different products on five different experimental visits. The same subjects are used for each visit and the same tests are carried out each time on all 3 products. What is the best way to radomise the presentation of the 3..
If two independent large samples are taken from two populations, the sampling distribution of the difference between the two sample means:
Suppose you are planning a sample of employees to determine the monthly average # of vacation days. Standards set: Confidence level of 99% and an error of less than 5 units. Standard deviation be 6 units. What would be the required sample size?
Determine the relationship between pretest scores and final exam scores after controlling for cumulative GPA. Compute SPSS test would you run?
(a) At the 5 percent level of significance, does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule. (b) Is this a close decision?
Construct a distribution to represent the population such that the survey result above may be seen as a sample from the population.
Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer
Find the probability that fewer than 5 are satisfied with the airlines. (c)Find the probability that 8 or more are satisfied with the airlines.
Consider a finite size population for N in which you want to study a variable y that takes a very small value for the first element of the sampling frame
The manufacturer wanted to determine if the tires were exceeding the guarantee. At the .05 significant level, it was concluded that the tires are exceeding the manufacturer's guarantee.
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