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It has been shown that people drive 5 - 10mph faster than the posted speed limit on a highway. It has been thought that changing the speed limit from 65mph to 70mph would not increase the "typical" speed of 70 - 75mph. On one stretch of a highway the speed limit was increase from 65mph to 70mph. If the population mean speed on this stretch of the highway has been 68mph with a standard deviation of 5mph, what is the sample size needed to detect an increase in speed on this stretch of the highway of 10mph? Let ? = 0.02 and ? = 0.05
Write the null and alternative hypotheses:
Draw the curves and label ? and ?:
Calculate the sample size:
a cardiologist has a device that measures prothrombin clotting times protimes of patients who are taking the blood
Suppose these data represent whole population. Determine the population mean and population standard deviation.
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Use the given margin of error, confidence level, and population standard deviation (o) to find the minimum sample size required to estimate an unknown population means (u)
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P-value for test statistic is .085, determine the minimum level of significance needed to reject null hypothesis?
q1. a research shows that employee salaries at company xyx in thousands of dollars are given by the equation y-hat 48.5
as the quality engineer for a small chain of fast food restaurants called mcdowells theyve got the big mac weve got the
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