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Assume the life of a packaged magnetic disk exposed to corrosive gases has a Weibull distribution with ß = 0.5 and the mean life is 600 hours.
a) Determine the probability that a packaged disk lasts at least 500 hours.
b) Determine the probability that a packaged disk fails before 400 hours.
If writing scores for population have standard deviation of s = 20, does sample give sufficient evidence to conclude that new composition course has significant effect? Suppose a two tailed test with a = 0.05.
I have the t-score of 1.660 an a standard error of .036. I hope they are correct, but also need the test effect and test statistic, p-value.
A random sample of 100 automobiles has a mean speed of 36 miles per hour and a standard deviation of 5 miles per hour. Is there enough evidence to support the claim at alpha=0.05?
In order to compare the means of two populations, independent random samples of 484 observations are selected from each population, with the following results:
A farm brings 15 tons of watermelon to market. Find a 90% confidence interval for the population mean cash value of this crop. What is the margin of error?
Create a 90% confidence interval for mean score on this placement exam for all students.
What is the smallest sample size needed to estimate the mean amount reimbursed to within 50 cents with 90% confidence, if a preliminary study indicates that the sample standard deviation of all amounts reimbursed is $3.00
The accomanying table is a one way, independent groups ANOVA summary table with part of material missing.assuming an equal number of subject are there in each group. What is the value of F crit, using alpha 0.05?
The sample mean is 50, the t-critical value is 1.96, and the standard error of the sample mean is 2.
Which of these measurement scales (nominal, ordinal, interval and ratio) can be handled through hypothesis testing? What are the five steps in hypothesis testing? Is the order important? Why or why not?
Explain why the sequence is important. What might happen if the hypothesis test is performed before the researcher has decided on the significance level?
1. Suppose you are given a particular set of data and found that r = 2.5. How would you interpret this result?
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