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1. Using the z-table (Table E), find the critical value (or values) for a a = .14 right-tailed test.
1. 0.1406
2. 1.08
3. 0.0557
4. 1.54
2. At a certain university, the average cost of books per student was $400 per student last semester. In a sample of 40 students this semester, their average cost was $430 with a standard deviation of $80. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
a. 15.00
b. 2.37
c. 0.38
d. 0.75
If it is determined that there is no difference between the population mean being represented by the sample and the mean of the population at large, then:
A teacher gave a 25 question multiple choice test. After scoring the tests, she computed a mean and standard deviation of the scores. The standard deviation was 0. Based on this information
The Johnson family uses a propane tank for cooking on their gas grill. During the summer they need to replace their tank on average every 30 days.
An independent financial advisor claims an average rate of return, μ, on a particular investment is at least 7%. In testing her claim, the correct pair of hypotheses is:
Using the original data, estimate the population standard deviation with 90% probability.
Which of given is the correct decision statement for test?
(A) What sums are needed to calculate a correlation coefficient? (B) What are the two ways of testing a correlation coefficient for significance?
Then describe trade-offs which will happen when you lower sample to $10,000 to meet their budget.
What is the probability that a student who has failed the test came from the South District?
The mean of a normal probability distribution is 60; the standard deviation is 5.
How many degrees of freedom must researcher use in her t-test critical value supposing that variances are equal?
What additional strategies (up to 3) you would propose that may increase validity of the findings.
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