5.2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What's the formula to find the z-score? | (x-u)/o
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| what are the steps to finding the probability of a normal distribution? | 1. find z score 2. find z score on table
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| Survey indicates ppl use their cell an average of 1.5 yrs before buying a new one. The stand dev is .25 yrs. Cell phone user randomly selected. Find prob user will use phone for less than 1 yr before buying new on. Assume variable x is normally dist. | u=1.5, o=.25, shaded area x<1; z-score=(1-1.5)/.23=-2; P(z<-2)=.0228. So 2.28% of cellular phone users will use their cellular phone for less than 1 yr before buying a new one.
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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