mathstatistics
posted by Stephanie .
18) Which of the following is the most significant result?
A) P<.001
B) P<.005
C) P=.05
D) P>.05
Okay, I have the answer key and know the question is A, but I always thought that if the P value is greater than .05 than it IS considered significant and you can reject your null hypothesisam I wrong??
19) Also somewhat of a smilar question:
Which of the following is the most significant result?
A) t9df=2.538 for a 1sided t test
B) t15df=2.538 for a 2 sided ttest
C) t26df= 2.538 for a 1sided t test
D) t49df= 2.538 for a 2 sided ttest
I have the same problem here, the first multiple choice letter that I rejected (choice C) was the right answer?!?!

You can reject Ho if p ≤ .05, which means that the results you have found would happen by chance 5% of the time or less. P > .05 means that there is a greater than 5% probability that the results were due to chance. Under those conditions, I would not reject the Ho.
Since I have not worked in the area for some time, for your last question, I searched Google under the key words "ttest significance onetailed 'degrees of freedom'" to get these possible sources:
http://www.psychstat.missouristate.edu/introbook/sbk25.htm
http://www.bized.co.uk/timeweb/crunching/crunch_experiment_reviewb.htm
http://books.google.com/books?id=2oEQyOIyCbUC&pg=RA1139PA2&lpg=RA1139PA2&dq=%22t+test%22+significance+%22one+tailed%22+%22degrees+of+freedom%22&source=web&ots=hJ038C041Z&sig=KfJKzwtnGcQEtpchFKHTdV13Mio&hl=en
http://www.bized.co.uk/timeweb/crunching/crunch_experiment_reviewb.htm
http://books.google.com/books?id=2oEQyOIyCbUC&pg=RA1139PA2&lpg=RA1139PA2&dq=%22t+test%22+significance+%22one+tailed%22+%22degrees+of+freedom%22&source=web&ots=hJ038C041Z&sig=KfJKzwtnGcQEtpchFKHTdV13Mio&hl=en
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.
Respond to this Question
Similar Questions

chemistry
Hy Dr Bob222 this will be the last time I will bother you about this type of question. Can you please tell what I am doing wrong? 
engineering
represent each of the following to three significant figures and express each answer in SI units using an appropriate prefix: a)1568(10^5)mm b)0.005 63 mg 
Statistics  College
Dealing with binomials. P(Possible Prize) = 1/1000 n=52 P(winning)=P(x=1)= P(x=1)=52! (1!51!) (.(.001)1 (10.001)51 Is the answer 0.050949 OR 5.0949%? 
Physics
Calculate the answer for the following question and state the answer with the correct certainty and units. Given the values of b and h, find A. b=3.2 cm, h=10.1 cm A=1/2bh The answer is 16 cm^2, which was rounded to two significant … 
Chemistry
I have spent all afternoon (on Thanksgiving, no less) trying to figure out these postlab questions. We had to produce a precipitate of a reaction of: 1) 1 ml 1M Na2SO4 + 9mL 1M CaCl2 Our result was .569g 2) 5 ml 1M Na2SO4 + 5 ml 1M … 
Statistics
Consider the following multiple regression results. Using a= .05 as the significance level, identify all statistically significant predictors. In a relative sense, which variable has the strongest impact? 
College Business Statistic
One operation of a mill is to cut pieces of steel into parts that will later be used as the frame for front seats in an automobile. The steel is cut with a diamond saw and requires the resulting parts to be within ±0.005 inch of the … 
statistics
In a simple random sample of 250 fatherson pairs taken from a large population of such pairs, the mean height of the fathers is 68.5 inches and the SD is 2.5 inches; the mean height of the sons is 69 inches and the SD is 3 inches; … 
STATISTICS
A study examining the relationship between fetal Xray exposure and a particular type of childhood blood cancer found the following odds ratio (and 95% confidence interval) for the association: 2.44 (0.95 to 6.33). This result would … 
statistics
Use a table of tvalues to estimate the Pvalue for the specified onemean ttest. Lefttailed test, n=12, t= 3.412. a=p<0.005. b= p>0.005. c= 0.005<p<0.01.