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In a pulse rate research, a simple random sample of 120 men results in a mean of 80 beats per minute, and a standard deviation of 11 beats per minute. Based on the sample results, the researcher concludes that the pulse rates of men have a standard deviation greater than 10 beats per minutes. Use a 0.10 significance level to test the researcher's claim.
a) Identify the null hypothesis and alternative hypothesis.
b) Determine the test statistic. Show all work; writing the correct test statistic, without supporting work, will receive no credit.
c) Determine the P-value for this test. Show all work; writing the correct P-value, without supporting work, will receive no credit.
d) Is there sufficient evidence to support the researcher's claim? Explain.
What does standard deviation measure? In looking at the standard deviations of the "with fireplace" and "without fireplace" selling prices, one is much larger than the other.
When finding percentiles, if locator L is not whole number, one procedure is to interpolate so that locator of 23.75, for instance.
an automobile manufacturer would like to know what proportion of its customers are dissatisfied with the service
Find at least what % of the weights are within xbar ± 3.5s - pounds of a sample of high school football players.
Shows the percent of cases at or below a certain value. Thus, this graph always begins at 0% and ends at 100%.)
There is much discussion in the press about several states moving to legalizing marijuana, either for only medical purposes, or more extremely, for recreational purposes. Looking only at the economic impact (not moral implications) of such changes..
Listed below is a list of how long it takes for bands on stage to complete their first song (in seconds).
The number of hours a 100 watt bulb will operate before burning out is approximately normally distributed with standard deviation σ=50.
The city of Oakdale wishes to see if there is a linear relationship between the temperature and the amount of electricity used (in kilowatts). Based on the data in the table below, is there a significant linear relationship between temperature and th..
Customers enter the waiting line at a cafeteria on a first-come, first-served basis. The arrival rate follows a Poisson distribution, while service times follow an exponential distribution.
The (independent) visitors of a certain Web site may be divided into two groups: those who arrived on this site voluntarily (type I) and those who arrived there by chance or by error (type 11).
1. space shuttle astronauts consume an average of 3000 calories per day. one meal normally consists of a main dish a
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