7:04 PM: Marlies Blue has entered the room.
7:14 PM: Daniela Lopes has entered the room.
7:26 PM: John Beck(Ins) has entered the room.
7:26 PM: John Beck(Ins): Hi, Marlies and Daniela!
7:28 PM: John Beck(Ins): Cat got your tongue?
7:29 PM: John Beck(Ins): It's so quiet in this chat room!
7:30 PM: Christina Slaughter has entered the room.
7:30 PM: John Beck(Ins): Hi, Christina!
7:30 PM: Christina Slaughter: Hello how are you
7:31 PM: John Beck(Ins): I'm fantastic! How about you?
7:31 PM: Christina Slaughter: Pretty good weather sucks tho
7:31 PM: John Beck(Ins): Are you getting any weather back in Baltimore?
7:31 PM: Christina Slaughter: lots of rain
7:31 PM: John Beck(Ins): Good for the crops!
7:32 PM: Christina Slaughter: yea
7:32 PM: John Beck(Ins): We have a short lesson tonight so let's get started.
7:32 PM: Christina Slaughter: ok
7:32 PM: John Beck(Ins): Let me know when you are on Ch 11 p1 please.
7:32 PM: Christina Slaughter: there
7:32 PM: John Beck(Ins): Go to page 2, please.
7:33 PM: John Beck(Ins): Always sketch a graph!!
7:33 PM: John Beck(Ins): Go to page 3,please.
7:33 PM: John Beck(Ins): Yes, I will supply the table on test 3.
7:33 PM: John Beck(Ins): Go to page 4, please.
7:34 PM: John Beck(Ins): Go to page 5, please.
7:34 PM: John Beck(Ins): Go to page 6, please.
7:34 PM: John Beck(Ins): Easy stuff!
7:34 PM: John Beck(Ins): Right?
7:34 PM: Christina Slaughter: yea
7:34 PM: John Beck(Ins): Okay, go to page 7, please.
7:35 PM: John Beck(Ins): In other words, I'm looking for the dividing point for the Bs.
7:35 PM: John Beck(Ins): Go to page 8, please.
7:36 PM: John Beck(Ins): Once again, always sketch a graph.
7:36 PM: John Beck(Ins): Go to page 9, please.
7:36 PM: John Beck(Ins): Go to page 10, please.
7:37 PM: John Beck(Ins): I've substituted .84 for z , 3 for s, and 55 for x.
7:37 PM: John Beck(Ins): Go to page 11, please.
7:37 PM: John Beck(Ins): we need to get rid of that denominator, 3, so we multiply the expressions on both sides of the equal sign by 3.
7:37 PM: John Beck(Ins): Okay?
7:37 PM: Christina Slaughter: ok
7:37 PM: John Beck(Ins): Go to page 12, please.
7:38 PM: John Beck(Ins): Next we need to solve for x, so we'll be adding 55 to the expressions on both sides of the equal sign.
7:38 PM: John Beck(Ins): Go to page 13, please.
7:38 PM: John Beck(Ins): Go to page 14, please.
7:39 PM: John Beck(Ins): So if your score is below 57.52 you don't get an A or a B.
7:40 PM: John Beck(Ins): Okay, let's look at another concept related to the normal curve.
7:40 PM: John Beck(Ins): Go to page 15, please.
7:40 PM: John Beck(Ins): This is a frequency histogram.
7:40 PM: John Beck(Ins): Notice that the vertical line at the point 0 is smaller than all of the lines except the line for 18.
7:41 PM: John Beck(Ins): In fact, it looks like this frequency histogram looks much line a normal curve.
7:41 PM: John Beck(Ins): Go to page 16, please.
7:42 PM: John Beck(Ins): Go to page 17, please.
7:42 PM: John Beck(Ins): Notice that I've shaded the region above 10.5
7:43 PM: John Beck(Ins): You could never toss a coin 18 times and get 10.5 heads, but we're using a "normal approximation" for a binomial event.
7:43 PM: Christina Slaughter: ok
7:43 PM: John Beck(Ins): In other words a score of 10.5 on the normal curve would round off ast 11.
7:44 PM: John Beck(Ins): Similarly for an outcome of 10.6, 10.7, etc.
7:44 PM: John Beck(Ins): We are doing this "normal approximation" because it would be a pain to use our formula for binomial outcomes for P(11) + P(12) + P(13)... + P(18)
7:45 PM: John Beck(Ins): Go to page 18, please.
7:45 PM: John Beck(Ins): Our region is "detached" so we know we're going to be subtracting.
7:45 PM: John Beck(Ins): Go to page 19, please.
7:45 PM: John Beck(Ins): Go to page 20, please.
7:46 PM: John Beck(Ins): Let's click on Tools, then Definitions, please.
7:46 PM: Christina Slaughter: ok
7:46 PM: Julia Gonzales has entered the room.
7:46 PM: John Beck(Ins): This formula will be available on Test 3.
7:47 PM: John Beck(Ins): Hi, Julia! We're on Ch 11, p20
7:47 PM: John Beck(Ins): In fact, we've clicked on Tools, then Definitions.
7:47 PM: Julia Gonzales: hey
7:48 PM: John Beck(Ins): If we are going to use a "normal approximation" for our binomial distribution, we need a formula for the mean, xbar, and the standard deviation, s.
7:48 PM: John Beck(Ins): The mean is n times the probability for a success.
7:48 PM: John Beck(Ins): The standard deviation is the square root of n times p times q.
7:48 PM: John Beck(Ins): Okay?
7:48 PM: Christina Slaughter: ok
7:49 PM: Marlies Blue: ok
7:49 PM: Julia Gonzales: k
7:49 PM: John Beck(Ins): Hi, Marlies!
7:49 PM: Marlies Blue: Hi
7:49 PM: John Beck(Ins): Okay, Let's click on "Hide 'em", please.
7:49 PM: John Beck(Ins): Go to page 21, please.
7:50 PM: John Beck(Ins): I've rounded off the standard deviation to 2 decimal places.
7:50 PM: John Beck(Ins): Go to page 22, please.
7:50 PM: John Beck(Ins): Go to page 23, please.
7:50 PM: John Beck(Ins): For x = 10.5, z = .71
7:50 PM: John Beck(Ins): Go to page 24, please.
7:51 PM: John Beck(Ins): Go to page 25,please.
7:51 PM: John Beck(Ins): Remember, this is a detached region, so we must subtract.
7:51 PM: John Beck(Ins): Any questions?
7:51 PM: Christina Slaughter: nope
7:52 PM: Marlies Blue: no
7:52 PM: Julia Gonzales: no i will look at things later
7:52 PM: John Beck(Ins): Go to page 26, please.
7:52 PM: John Beck(Ins): Go to page 27, please.
7:53 PM: John Beck(Ins): On the normal curve, any value between 8.5 and 9.5 would be rounded off to 8.
7:53 PM: John Beck(Ins): I know we couldn't toss 8.5 heads, but we are using a normal curve to approximate what we'd have for exactly 8 heads.
7:53 PM: Julia Gonzales: why not 9
7:54 PM: John Beck(Ins): OOps, 7.5 to 8.5
7:54 PM: John Beck(Ins): Thanks, Julia.
7:55 PM: John Beck(Ins): Remember, this is an approximation so we don't have to use 7.51 and 8.49 as our end points.
7:55 PM: John Beck(Ins): We'll assume that any score between 7.5 and 8.5 will round off to 8.
7:55 PM: John Beck(Ins): Okay?
7:55 PM: Julia Gonzales: yes
7:56 PM: John Beck(Ins): Go to page 28, please.
7:56 PM: John Beck(Ins): We've already calculated xbar and s.
7:56 PM: John Beck(Ins): Go to page 29, please.
7:56 PM: John Beck(Ins): Go to page 30, please.
7:57 PM: John Beck(Ins): This is a "detached" region, so we know that we are going to be subtracting!
7:57 PM: John Beck(Ins): Go to page 31, please.
7:57 PM: John Beck(Ins): Any questions?
7:57 PM: Christina Slaughter: no
7:58 PM: Julia Gonzales: not yet
7:58 PM: John Beck(Ins): Guess what, Class? We're ready for Test 3!
7:58 PM: Marlies Blue: almost
7:58 PM: Julia Gonzales: far from it what is the dead line
7:58 PM: John Beck(Ins): I think the deadline for Test 3 is a week from next Monday.
7:58 PM: John Beck(Ins): About the 23rd?
7:59 PM: Julia Gonzales: thks
7:59 PM: John Beck(Ins): Okay, Class, any questions?
7:59 PM: Christina Slaughter: yea the 23rd is the last day
7:59 PM: John Beck(Ins): Thanks, Christina.
7:59 PM: Marlies Blue: no ?
7:59 PM: Christina Slaughter: no questions have a great weekend n goodnight
7:59 PM: Julia Gonzales: i should be able to pull the chat log tomorrow to get what I missed right
8:00 PM: John Beck(Ins): Don't forget you have a practice test on your CD!
8:00 PM: John Beck(Ins): I'll post it early tomorrow, Julia.
8:00 PM: Christina Slaughter: ok
8:00 PM: Christina Slaughter has left the room.
8:00 PM: Julia Gonzales: thks again good night
8:00 PM: John Beck(Ins): G'night, Class.
8:00 PM: Julia Gonzales has left the room.
8:00 PM: Marlies Blue: nite
8:01 PM: John Beck(Ins) has left the room.
8:01 PM: Marlies Blue has left the room.
8:02 PM: Daniela Lopes has left the room.
8:02 PM: James Harrison Jr has entered the room.
8:02 PM: James Harrison Jr has left the room.