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A research team plans to test the null hypothesis that ? = .45, sigma=.5. the test is right sided. a sample size of n=1550 is observed.
When the null hypothesis is true, and n=1550, what is the standard deviation of the sampling distribution of means?
If the standard deviation is $1050, how large a sample is needed to get the desired information and to be accurate within $200?
An automobile manufacturer advertises that the mean petrol consumption of its new hybrid car does not exceed 4.6 litres per 100 km. An independent company decides to test the manufacturer's claim by selecting a random sample of 16 vehicles and mea..
Let A and B denote genetic characteristics and suppose that the probability is 1/3 that an individual chosen will exhibit A, 2/5 that he or she will exhibit B. Assume that these characteristics occur independently. What is the probability that an ind..
Use the information given to calculate the standard error of the mean. Mean systolic blood pressure for a sample of n=324 men is =123.5, and the standard deviation is s=9.
Under older Federal Aviation Administration rules, airlines had to estimate the weight of a passenger as 185 pounds. That amount is for an adult traveling in winter, and it includes 20 pounds of carry-on baggage.
question on saturdays cars arrive at sami schmitts scrub and shine car wash at the rate of 8 cars per twenty minute
Many people do not "like" or "trust" single point estimates for things they need measured.
Manufacturer of guitar amplifiers markets one of its models,
a group of 14 friends got together for a wine contest. each guest brought his or her favorite bottle of pinot noir.
Pulse rate is an important measure of the fitness of a person's cardiovascular system. The mean pulse rate for all U.S. adult males is approximately 72 heart beats per minute.
At the 0,05 level, can we conclude that women think men are less kind, gentle, and thoughtful in the later survey compared with the earlier one?
Standard deviation was 16. Determine the 99% confidence interval of true mean. Suppose the variable is normally distributed.
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