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A study considered the question, "Are you a registered voter?" Accuracy of response was confirmed by a check of city voting records. Two methods of survey were used: face-to-face interview and telephone interview. A random sample of 93 people were asked the voter registration question face-to-face. Seventy-nine respondents gave accurate answers. Another random sample of 83 people were asked the same question during a telephone interview. Seventy-four respondents gave accurate answers. Assume that the samples are representatives of the general population. Test the claim that there is a difference in the proportion of accurate responses from face-to-face compared with telephone interviews. alpha=.05
If we assume that the lifetime of this type of bulb has a standard deviation of 400 hours, can we conclude at the 5% significance level that the claim is true.
in order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is
The normal serum hemocrit level is 0.41 milligrams to 100 milligrams of blood. The level in elderly patients is significantly low at 0.31.
1.which of the following would have a binomial distribution?a.a couple will have children until they have three girls
computing the probability values using normal distribution.each month an american household generates an average of 28
A random group of apartments was selected from a city to analize the number of bedrooms they have. Is there evidence to reject the hypothesis that the apartments are equally distributed between 1 bedroom, 2 bedroom, and 3 bedroom apartments, at al..
emily is interested in understanding if there is a relationship between whether or not people think the diversity
the cost of a one-carat vs2 clarity h color diamond from diamond source use is 5600. a midwestern jeweler makes calls
Explain the terms parameter and statistics. Make sure the concepts of population and sample are included in the definitions.
A large discount chain compares the performance of its credit managers in Ohio and Illinois by comparing the mean dollar amounts owed by customers with delinquent charge accounts in these two states.
Calculate the mean of the 20 samples and draw a histogram showing the 20 sample means and describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
A local bakery uses its stock of sugar according to demand for its products. Indeed, the weekly sugar use follows approximately a normal distribution with mean 2,400 lb. and with standard deviation 400lb.
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