Psychology Short Assignment

Calculate the mean and standard deviation for this data set: 250, 300, 300, 325, 325, 350, 350, 350, 350, 375, 400, 425, 425, 450, 450, 500 (Note: When computing go out to three decimal places and remember to use n – 1 rather than n).
M = 370.313
M = 380.313
M = 370.343
M = 470.373

Question 31 pts
Calculate the standard deviation for this data set: 250, 300, 300, 325, 325, 350, 350, 350, 350, 375, 400, 425, 425, 450, 450, 500 (Note: When computing go out to three decimal places and remember to use n – 1 rather than n).
SD = 66.795
SD = 56.596
SD = 66.595
SD = 36.495

Question 41 pts
How many books are above the mean?
9
7
5
4

Question 51 pts
How many are below the mean?
9
7
5
4

Question 61 pts
How many books are within one standard deviation of the mean?
11
10
8
7

Question 71 pts
What percent of the data is more than one standard deviation above the mean?
33.56%
35.76%
43.57%
43.75%

Question 81 pts
Provide the z score for a book with an original number of pages of 425. (Round to three decimal places)
0.305
0.821
-1.807
0.680

Question 91 pts
Provide the z score for a book with an original number of pages of 300. (Round to three decimal places)
-1.056
0.680
-1.807
0.070
How many pages does a book need to have to fall into the top 25% of pages in this data set?

The book needs to over 494.76 pages to be in the top 25%

The book needs to be over 234.78 pages to be in the top 25%

The book needs to have at least 374.84 pages to be in the top 25%

The book needs to have at least 434.87 pages to be in the top 25%