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April 17, 2014

Homework Help: math Statistics

Posted by Sara on Sunday, February 19, 2012 at 12:56pm.

Hi I need help with Statistics. Can anyone help me to understand it better? I am in fear that if I do not figure this out soon I will fail my class. I am needing help with the chapters 12,and 13. in the book called Statistical Reasoning in the Behavioral Sciences, 6th edition.

1. State whether each of the items in the list could be an alternative hypothesis and if so whether it would be a one tailed test or a two tailed test.
x- >345
x≠12
x-=67
x<89
x-<123
x=45
x>678
x-≠910

2. Two years ago, a complete survey of all male students in a large university indicated that the mean number of males that smoked per day was 8.3 with a standard deviation of 3.7. the director of the school wanted to see if the habits changed over the past two years. He got these results from the students: x- =7.7 n=108.
set up Ho and Ha
Perform the statical test (α =.05)
draw a conclusion.
3. the PTA at central H.S. is concerned that the students who graduate from the school do not score as well on the math test, on average, as do students from other school district. to address their concerns the principle randomly selected 15 students from the graduating class and administers the math teat used in that school district. the mean of the scores is 98. the scores of the 15 students from central high school are as follows: 105,98, 101, 110,96, 103, 104, 101, 98, 105, 112, 95, 105, 100, 108.
state formally the hypotheses necessary to conduct a nondirectional test
complete the test at the .05 level of significance and state your conclusion.
4.an industral/orginizational psychologist used a new training program designed to improve basic work shills. the traing program is typically judged as effective if average scores on a basic work skills test exceed 80. the psychologist obtained a random sample of participants who recently completed the training program, then administered to them a work skills test. their scores on the trest are givin in data 12A.
Data 12A
state the null and alt. hypothesis best suited to the nature of the psychologest inquiry
using IBM SPSS test the null hypothesis at the .01 level of significance and state your conclusion
5. with regard to Data 13A...
if α = .05 and true=83.0 what is β
what is the power of the test?
if α=.01 and true = 83.0 what is β
what is the power of the test?


Data 12A:
83 78 85 85 82 74 79 78 88 80 85 81 85 88 84 86 87 87 82 87 87 87 82 91 75 85 82 92 87 83 84 94 84 77 86 89 83 89 90 82 94 97 84 78 90 82 86 80 88 89 82 86 88 82 75 77 94 79 88 89

Data 13A:
Ho:x= 80.0 Ha:x≠80.0 σx=20.0 n=100

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