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Which of the following would be most useful in checking normality assumption of the errors in a regression model?
Fishers for scallops on the New England coast were fishing and when the boat came in, the average weight of the scallops were supposed to be 1/36th of a pond. The ship was accused of violating the w
The random variable X is stated to be the number of ones obtained in n tosses of a fair, sided die.
Two registers in a microprocessor are read at the random times which are statistically independent. Each register is read once. If the time at which each register is read is uniformly distributed fr
A researcher is interested in whether the certain hour-long film which portrays the insidious effects of the racial prejudice will affect attitudes toward minority group.
Employ formal hypothesis testing and use the appropriate analysis to find out if there are any significant mean differences among three groups. Employ Tukey's HSD test to determine which groups are
A civil service exam yields scores with a mean of 81 and a standard deviation of 5.5. Using Chebyshev's Theorem what can we say about the percentage of scores that are above 92?
It has been conjectured by U.S. Census Bureau that "approximately 60% of foreign-born people who live in the U.S. are not naturalized citizens". Suppose that in a national random sample of 70 foreig
A researcher in sports medicine hypothesizes a mean resting pulse rate of 60 beats per minute for the population of long-distance college runners. A random sample of 20 long distance runners was sel
Assume that the drying time for certain kind of paint under specified test conditions is known to be normally distributed with mean 75 minutes and standard deviation 5 minutes. Assume also that chem
Customers experiencing technical difficulty with their internet cable hookup might call 800 number for technical support. It takes the technician between 150 seconds to 13 minutes to resolve the pro
In a busy coffee shop, which is a member of an international chain of coffee shops, 40% of customers order a pastry in addition to their drink. If 20 customers were selected at random during one bus
A normal population has a mean of 65 and a standard deviation of 13. You select a random sample of 25. Calculate the probability the sample mean is (Round z values to 2 decimal places and final answer
The State of New Hampshire conducts weekly lottery to raise funds for the school districts in the state. Suppose a million tickets are sold. One ticket is the wining ticket and the winner receives $
In a recent poll, 110 people were asked if they liked dogs, and 7% said they did. Find the margin of error of this poll, at the 99% confidence level.
The distribution of house prices is skewed to the right because most houses cost a modest amount but a few cost a very large amount. If you take a random sample of 1000 houses.
Suppose 20% of all heart transplant patients do not survive the operation.
The Greater Pittsburgh Area Chamber of Commerce wants to estimate the mean time workers who are employed in the downtown area spend getting to work. A sample of 15 workers reveals the following numb
Suppose that a sample is employed to estimate a population proportion p. Find the margin of error M.E. that corresponds to a sample of size 181 with 65.2% successes at a confidence level of 80%.
You intend to determine a population proportion with a confidence interval. The data suggests that the normal distribution is a reasonable approximation for the binomial distribution in this case.
A normal population has a mean of 65 and a standard deviation of 13. You select a random sample of 25. Compute the probability the sample mean is (Round z values to 2 decimal places and final answers
Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,025 per hour and a standard deviation of $290.
Three Groups of people are asked to rate a movie on a 1 (poor) to 5 (excellent) scale. The results are:
A matched-subjects study and independent-measures study both produced a t statistic with df = 16. How many individuals participated in each study?
If n = 15 for each sample, which of the following sets of data provides the clearest difference between the two samples?