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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 alpha = 0.02 and beta = 0.05
Write the null and alternative hypotheses:
Draw the curves and label alpha and beta:
Calculate the sample size:
in a recent new york city marathon 25221 men finished and 253 dropped out. also 12883 women finished and 163 dropped
At the end of each academic year, 13% of assistant professors become associate professors and 18% leave the department; 21% of associate professors become full professors, and 17% leave the department; and 9% of full professors leave the departmen..
Carpet City wants to develops a means to forecast it carpet sale. The store manager believes that the store's sale are directly related to the number of new housing starts in town.
Calculate the coefficient of determination, given that the linear correlation coefficient, r, is -0.625. What does this tell you about the explained variation and the unexplained variation of the data about the regression line?
todays local newspaper lists 22 stocks of local interest. of theses stocks eleven increase five decreased and six
The students were asked to evaluate the effectiveness of the format on an 11-point scale (1 = poor, 11 = excellent). What are the degrees of freedom associated with the test statistic?
A sample of 148 of our statistics students rated their level of admiration for Hilary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06 and the standard deviation was 1.70.
the distribution of the annual incomes of a group of middle management employees approximated a normal distribution
True mean when using a confidence interval of 95%. The standard deviation is estimated at $25. How many lunch receipts must they sample?
Using a significance level of 0.05, can we conclude from this information that the course is successful in improving individuals' knowledge of Web page design?
a bank estimated the average amount of money withdrawn from its atm machines over weekends exceeds 150 per customer
In a random sample of 200 person of a town 120 are found to the tea drinker.In a random sample of 500 person of another town 240 are found to be tea drinker.Is the proprtion of tea drinker in the two towns are equal? use .001 level significance.
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