Posted by Artmisha on Friday, May 30, 2014 at 2:16pm.
For 3 and 4 find the range, variance, and standard deviation. Round to the nearest tenth.
3. Twelve students were given an arithmetic test and the times (in minutes) to complete it were
10, 9, 12, 11, 8, 15, 9, 7, 8, 6, 12, 10
4. The normal daily temperatures (in degrees Fahrenheit) in January for 10 selected cities are as follows.
50, 37, 29, 54, 30, 61, 47, 38, 34, 61
5. If a history test has a mean of 100 and a standard deviation of 10, find the corresponding z score for a test score of 115.

Statistic  Damon, Friday, May 30, 2014 at 3:22pm
http://easycalculation.com/statistics/standarddeviation.php

Statistic  Damon, Friday, May 30, 2014 at 3:23pm
5.
115  100 = 15
z score means how many standard deviations away from mean
so
15/10 = 1.5
A+ :)

Statistic  PsyDAG, Saturday, May 31, 2014 at 1:16pm
To do the calculations yourself for 3 and 4:
Range = highest score  lowest
Find the mean first = sum of scores/number of scores
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
Standard deviation = square root of variance
For 5, this is the equation used:
Z = (scoremean)/SD
Answer This Question
Related Questions
 standard deviation  If Professor Wilson found that the test scores of his ...
 Consumer math  Complete the chart to find the mean, variance and standard ...
 college math  20. Calculate the range, variance, and standard deviation of the ...
 statistics  The times taken to complete a statistics test by all students are ...
 statistics  The times taken to complete a statistics test by all students are ...
 college statistics  the average length of time required for students to ...
 statistic  A final exam in Math 160 has a mean of 73 with standard deviation 7....
 Statistics Range, Variance, and Standard Deviation  26. Flight Data: Find the ...
 statistics  a random sample of 80 college students was selected to participate ...
 statistic  . The average time a student spends studying just prior to a test is...
More Related Questions