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A University employment office wants to compare the time taken by graduates with 3 different majors to find their first jobs after graduation. The following tables lists the time (in days) taken to find their first full time job after graduation for a random sample of 8 business majors, 7 computer science majors & 6 engineering majors who graduated in May 2005.
Business Computer Engineering Science
36 56 26
62 13 51
35 24 63
80 28 46
27 47 78
48 44 34
76 20
44
At the 5% significance level, can you conclude that the mean time taken to find their first job for all 2005 graduates in these fields is the same?
f x has a normal distribution with mean µ=15 and standard deviation σ= 3, describe the distribution of x values for sample size n, where n = 4, n = 16, and n = 100. How do the x distributions compare for the various sample sizes?
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
A researcher investigating sex role stereotypes and occupational aspirations drew a random sample of 125 female university students.
The height of a tree will be measured using a clinometer. For this device, the measurement error has a normal distribution with mean meter and standard deviation . If the tree is exactly 35 meters tall, what is the probability that the clinometer ..
Compute a 95% confidence interval for the population mean, based on the sample 25, 27, 23, 24, 25, 24 and 59. Change the number from 59 to 24 and recalculate the confidence interval.
Develop a 90% confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of +/- 0.03 grams with 90% confidence?
At α = 0.10 test the claim that there is a difference in means of the salaries. (a) State the Hypotheses: (b) Compute the Test statistic: (Round off correctly)
Find the test statistic value for two mean tests in large sample.
Estimate and interpret the p-value of the calculated test statistic above.
Operators are to answer telephone calls from customers in an average time of 0.1 minute or less, and either respond to or refer to the proper department within 0.5 minute.
The Sony corporation produces a Walkman that requires two AA Batteries. The mean life of these batteries in this product is 35.0 hours. The distribtion of the battery lives closely follows the normal probability distribtion with a standard deviati..
In the North American court system, a defendant is assumed innocent until proven guilty. In an ideal world, we would expect that the truly innocent will always go free, whereas the truly guilty ones will always be convicted.
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