Recent Homework Questions About Statistics
In a study of caffeine and stress, college students indicate how many cups of coffee they drink per day and their stress level on a scale of 1 to 10. The date follow: Number of Cups of Coffee 3,2,4,6,5,1,7,3 Stress Level 5,3,3,9,4,2,10,5 Calculate a Pearsons r to determine the...
Thursday, November 7, 2013 at 8:47pm
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. See your previous post.
Thursday, November 7, 2013 at 11:13am
You draw nine cards from a standard deck of cards. What is the probability that a. four or more will be red, b. exactly two or three will be red, c. two or fewer will be red, and d. exactly five will be red?.
Thursday, November 7, 2013 at 8:30am
a nice calculator can be found at http://easycalculation.com/statistics/standard-deviation.php It will verify the answers which you have calculated on your own >wink wink<
Thursday, November 7, 2013 at 3:32am
Using a 0.05 level of significance, test the hypothesis that the probability of the NCAA Division I basketball champion being from the Pac 10 is 20%. Repeat the test for the hypothesis that the probability the champion is UCLA is 20%. What do these results say about testing ...
Thursday, November 7, 2013 at 2:49am
When consumers apply for credit, their credit is rated using the FICO score. A bank manager used a random sample of the credit scores of 18 customers and determined the following 95% confidence interval: (613.6, 708.0) If the sample used 45 customers rather than 18 customers, ...
Wednesday, November 6, 2013 at 7:51pm
2E + 188 = 206 2E = 206-188 2E = 18 E = 9 Answer B
Wednesday, November 6, 2013 at 7:49pm
In a large collection of real SMS text messages from particular cellphone users, 13.40% of messages are identified as spam. Of all spam messages 17.0% contain both the word "free" and the word "text" ("txt") For example, "Congrats!! You have ...
Tuesday, November 5, 2013 at 5:54pm
Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score. Multiply by 100 to get the percentage.
Tuesday, November 5, 2013 at 4:49pm
I'm not sure
Tuesday, November 5, 2013 at 11:13am
True 1. CORRELATION Correlation means that two variables (sets of data) have some type of association with each other, such that as one variable increases, the other also increases (a positive correlation), or decreases (a negative correlation).
Tuesday, November 5, 2013 at 10:41am
P(X ≥ 13) = P (X= 13) + P (X = 14) + P (X = 15) P(X ≥ 13) =(15C13)(.9)^13(.1)^2+ (15C14)(.9)^14(.1)^1+ (15C15)(.9)^15(.1)^0 = .8159
Monday, November 4, 2013 at 8:08pm
P(20 < x < 23) = P(X = 20 ) + P (X = 21) + P(X = 22) + P(X = 23) P(20 < x < 23) = (30C20)(.23)^20(.77)^10 + (30C21)(.23)^21(.77)^9 + (30C22)(.23)^22(.77)^8 + (30C23)(.23)^23(.77)^7 = ?
Monday, November 4, 2013 at 1:42pm
When groups of data are separated, an association can get stronger because of a lurking variable. That lurking variable is usually the number of observations in the different groups of data.
Sunday, February 24, 2013 at 11:07pm