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Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Identify the null and alternative hypotheses, test statistic, P-value, critical value(s), and state the final conclusion that addresses the original claim.
A coin mint has a specification that a particular coin has a mean weight of 2.5g. A sample of 39 coins was collected. Those coins have a mean weight of 2.49582 g. and a standard deviation of 0.01442g. Ude a 0.05 significant level to test the claim that this sample is from a population with a mean weight equal to 2.5 g. Do th coins appear to conform to the specications of the coin mint?
Based on past information, for the cars used, the distance traveled by a car in a day averages 170 km with a standard deviation of 40 km. What proportion of cars used in any day travel less than 100 km?
A marketing firm asked a random set of married and single men as to how much they were willing to spend for a vacation. At = .05, is a difference in the two amounts?
Conduct a study to examine the relationship between party affiliation and gender. You find the following:
it is estimated that 3.6 of the general population will live past their 90th birthday. in a graduating class of 733
A standard deviation of 20. If the seller wishes to have adequate stock 95% of the time, how many of the games must she keep on hand.
If the writing scores for the population have a standard deviation of σ = 20, does the sample provide enough evidence to conclude that the new composition course has a significant effect?
Assume each lifetime is independent. Round your answer to four decimal places (e.g. 98.7654). What is the probability that the lathe will operate at least seven years?
The letters of the word PRESERVE are arranged at random. Then what is the probability that all the 3 E's occur together??
Normal distribution with a mean of 33 oz. and a standard deviation of 0.7 oz. What proportion of packets are underweight (i.e., weigh less than 32 oz.)?
How many boxes must the processor sample to be 95 percent confident that the sample mean does not differ from the population mean by more than 0.2 pounds?
The table given below shows joint probability distribution of X and Y . Determine the covariance between the X and Y ?
Expectation and variance of a random variable and let X be a random variable with the following probability distribution:
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