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In sample of 800 students in university, 360, or 45%, live in the dormitories. The 45% is an example of
In determining the sample size necessary to estimate a population proportion, which of the following information is not needed?
At the large department store, the average number of years of employment for cashier is 5.7 with standard deviation of 1.8 years. If the number of years of employment at this department store is nor
A researcher wishes to know, with 98% confidence, the percentage of women who wear shoes which are too small for their feet. A previous study conducted by Academy of Orthopedic Surgeons found that 8
A previous study of the nickels showed that standard deviation of the weight of nickels is 150 milligrams. How many nickels does a coin counter manufacturer need to weigh so that she can be 98% conf
Assume that for sample of n=11 measurements, we find out that (xbar=72) and s=5. Suppose normality, calculate the confidence intervals for population mean U with the following levels of confidence:
For the most current year available, the mean annual cost to attend a private university in the United States was $20,157. Assume the distribution of annual costs follows the normal probability dist
Assume we want 90% confidence interval for average amount of time (in minutes) spent per week on homework by students in large introductory statistics course at the large university.
In the test of statistical hypotheses, the P-value tells us
The upper 0.05 critical value of the standard Normal distribution is
The policy of Suburban Transit authority is to add a bus route if more than 55 percent of the potential commuters indicate they would use the particular route.
Smith is the weld inspector at the shipyard. He knows from keeping track of good as well as substandard welds that for the afternoon shift 5% of all welds done will be substandard. Of smith checks 3
Suppose a population has a mean of 7 for some charactertisic of interest and a standard deviation of 9.6. A sample is drawn from this population of size 64. What is the standard error of the mean?
A biologist reports the confidence interval of (4.1, 5.3) when determining the mean height(in centimeters) of a sample of seedlings. The estimated margin of error is? The sample mean is?
For most current year available, the mean annual cost to attend the private university in the United States was $20,157. Suppose the distribution of annual costs follows the normal probability distr
Suppose that the mean hourly cost to operate the commercial airplane follows the normal distribution with a mean of $2,300 per hour and a standard deviation of $245.
The number of viewers of American Idol has a mean of 32 million with a standard deviation of 4 million. Assume this distribution follows a normal distribution.
The average health care costs per year for a sample of U.S. cities (50,000~200,000 population) are $586, with a sample standard deviation of $116 (n=378). Salem contends that its new outpatient trea
The mean age of principals in the local school district is 56.7 years. If hypothesis test is performed, how should you interpret decision that rejects the null hypothesis?
If the population standard deviation of sigma = 5 and the sample size n = 25, then the margin of error for a 95% normal confidence interval is
The heights of fully grown trees of the particular species are normally distributed, with mean of 59.5 feet and standard deviation of 6.75 feet. Random samples of size 17 are drawn from population.
A study is trying to determine what percentage of students drive SUVs. The population parameter to be estimated is
The mean age of professors at the university is 55.3 years. If hypothesis test is carried out, how should you interpret a decision that fails to reject the null hypothesis?
What effect will an outlier have on a confidence interval that is based on a small sample size?
A professor wishes to calculate a confidence interval for the average percentage grade in the class. Which population parameter is being studied?