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In each of the following surveys, what besides the mechanism under study could have contributed to the result?
a. An estimation of per-capita wealth for a city is made from a random sample of people listed in the city's telephone directory.
b. Political preference is determined by an interviewer taking a random sample of Monday morning bank customers.
c. The average length of fish in a lake is estimated by:
i. The average length of fish caught, reported by anglers
ii. The average length of dead fish found floating in the water
d. The average number of words in the working vocabulary of first-grade children in a given county is estimated by a vocabulary test given to a random sample of first grade children in the largest school in the country.
e. The proportion of people who can distinguish between two similar tones is estimated on the basis of a test given to a random sample of university students in a music appreciation class.
A sample of 60 students from a large university is taken. The average age in the sample was 22 years with a standard deviation of 6 years.
In a certain country the distribution of income for the whole population follows a slightly right skewed distribution. Problem five: Lila programs the computer to take one thousand random samples of size 30 from the population.
Why do you think that is and can you think of other traditions or themes from religion or culture that have been adopted by others?
Determine the mean and the standard deviation of the sample.
Suppose you want to test the claim that population mean miu=3.5. Given a sample size of n=34 and a level of significance of alpha=0.01, when should you reject Ho?
You observe that classmates who get good grades tend to sit toward the front of the classroom, and those who receive poorer grades tend to sit toward the back.- What are three possible cause-and-effect relationships for this non experimental observ..
Hypothesis testing of single mean - can we conclude that the mean weight is greater than 16 ounces? Determine the p -value.
A gambler repeatedly plays a game where in each round, he wins a dollar with probability 1/3 and loses a dollar with probability 2/3.
An order of 25 high-reliability electron tubes has been shipped to your company. Your acceptance sampling protocol calls for selecting 5 at random to put through a destructive "accelerated life-test;" if fewer than 2 fail the test, the remaining 2..
The correct set of hypotheses to test the effect of the bonus plan, the difference between the t and z distributions
The distances travelled to work by a random sample of 12 people to their places of work in 1996 and again in 2006 are shown in the following table.
IQ tests generally have scores in which the mean is 100, and the standard deviation is 16. If your IQ score was 134, what percentage of the population would have a higher IQ than you?
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