Comprehension of this table is very important to success!
There is a table that should be utilized to look up standard normal probabilities. The z-score is divided into two parts, the whole number and tenth are looked up all along the left side and the hundredth is looked up across top. The value in intersection of the column and row is the area beneath the curve between zero and z-score looked up.
Since of symmetry of the normal distribution, look up the absolute value of z-score.
Computing Normal Probabilities:
There are many different situations which can occur whenever asked to find out normal probabilities.
1) Between zero and Look up the area in the tableany number.
2) Between two positives or Look up both areas in the table and subtract the smaller Between two negatives. from the bigger.
3) Between negative and Look up both regions in the table and add up them together.
4) Less than a negative or Look up the region in the table and subtract from 0.5000Greater than a positive 5) Greater than a negative or Look up the region in the table and add to 0.5000Less than a positive This can be shortened in two rules.
A) When there is just one z-score given, utilize 0.5000 for the second area, or else look up both the z-scores in table.
B) When the two numbers are of similar sign, then subtract; if they are of different signs, then add. When there is just one z-score, then utilize the inequality to find out the second sign (< is negative and > is positive).
Finding z-scores from probabilities:
This is much difficult and needs you to utilize the table inversely. You should look up the area among zero and the value on inner part of the table, and then read the z-score from outside. Lastly, decide if the z-score must be positive or negative, based on whether it was on left side or right side of the mean. Keep in mind that z-scores can be negative, however areas or probabilities can’t be.
Situation Instructions1) Area between 0 to a value Look up the region in the table Make negative if on left side
2) Area in one tail Subtract the region from 0.5000 Look up the difference in table Make negative when in the left tail
3) Area comprising one complete Subtract 0.5000 from the regionHalf (Less than a positive or Look up the difference in the tablebigger than negative) Make negative if on the left side 4) In z units of the mean Divide the region by 2 Look up the quotient in table Utilize both the negative and positive z-scores5) Two tails with equivalent area Subtract the region from 1.000(More than z units from the mean) Divide the area by 2 Look up the quotient in table Utilize both the negative and positive z-scores
Latest technology based Statistics Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Statistics help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Statistics, project ideas and tutorials. We provide email based Statistics help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Statistics. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Statistics Homework help and assignment help services. They use their experience, as they have solved thousands of the Statistics assignments, which may help you to solve your complex issues of Statistics. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!