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At 99% confidence, test to determine if there is sufficient evidence to indicate that process 2 takes a significantly longer time to manufacture the Zip drives.
The statistics of a certain production machine indicates that for every 1000 products produced, there are two rejected units. If a customer orders 180 units, what is the probability that the deliver
We want to test to determine if there has been a significant increase in the average yearly income of executives. Develop the null and alternative hypothesis for this problem.
Assume that scores in both classes follow a normal distribution. Convert Maria's midterm score of 84 to a standard z score
Suppose a simple random sample of size 51 is selected from a population with = 11. Find the value of the standard error of the mean in each of the following cases (use the finite population correcti
Using a two-tailed test with alpha level=.05, is there a significant difference between the two treatment conditions?
Meaning that 90% of the products are acceptable and the remainder are defective. If 4 of the products are randomly selected, find the probability that all of them are acceptable.
You wish to be 95% confident and have an error of 0.4 mpg. The standard deviation is estimated at 1.8. How big must the sample be?
Assuming that the population of chimps prone to heart disease has a mean and std. dev. of 214 and 36, what is the z-score of the typical unhealthy chimp for the critical value (235)?
Technological advances helped make inflatable paddlecraft suitable for backcountry use. These blow-up rubber boats, which can be rolled into a bundle not much bigger than a golf bag, are large enoug
the poor Different methods are needed for different designs SRS from Normal data, Shape of the population distribution and sample distribution Margin of error doesn"t cover all errors How small a P
The Tampa Bay (FLA) Area Chamber of Commerce wanted to know whether the mean weekly salary of nurses was larger than that of school teachers. It is believed that the historic variances of each group
Find the probability that the number who consider themselves baseball is (a) exactly 8, (b) at least 8, ;(c)less than 8.
To determine the efficiency of a batch of production of electric motors 8 are tested. The average efficiency of a sample is calculated to be 88.5% and the standard deviation of the sample is 0.5%. D
State the null and alternative hypotheses needed to attempt to establish that the advertisement increases the mean attitude score (that is, that the mean post-exposure attitude score is higher than
Suppose that the distribution of heights of all male students on your campus is Normal with mean 70 inches and standard deviation 2.8 inches. (a) If you choose one student at random, what is the pro
To test whether the effect of the last four binary variables is significant, you have your regression program calculate the relevant F-statistic, which is 0.295.
In a survey of 2480 golfers, 15% said they were left-handed. The survey's margin of error was 3%. Construct a confidence interval for the proportion of left-handed golfers.
For what values of x should we use this equation to make predictions? Below are the ordered pairs used to calculate the regression equation.
A die is loaded in such a way that the probabilities of getting 1,2,3,4,5 and 6 are 1/2, 1/6, 1/12,1/12, and 1/12, respectively.
The probability Mary will receive an A in a class is 0.31. Assuming independence, if she is taking 5 classes this semester, calculate the probability she will receive exactly 3 A's.
Assuming all factors affecting yields of the process have been held constant as possible during the test runs, it is reasonable to regard the 35 yields obtained using the new catalyst as random samp
Determine the test statistic (Z* or t*) and the p-value for each of the each of the following situations and determine if they would cause the rejection.
Conduct a complete hypothesis test to determine if Anthony Calvillo's passing performance in a given season does indeed exceed 3000 yards.
The average gas mileage of a certain model car is 29.0 miles per gallon. If the gas mileages are normally distributed with a standard deviation of 0.6 miles per gallon, find the probability that a c