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akhl

@akhl

Dazzler

Posted: 14 years ago

#281

Sorry, for some days, I was not checking this thread. So I missed questions from samera12 and Missy7. May be it is too late now. Let me know if you still need help.

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akhl

@akhl

Dazzler

Posted: 14 years ago

#282

A standard deck of cards consists of 52 cards. There are 13 cards in each of four suits- clubs, diamonds, hearts and spades. Within each suit, there are 13 denominators- Ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen and King, the last three of which are known as "face cards".

a) we have two shuffled decks of cards and we randomly select one card from each deck. The outcome of interest is the suit of each of the two cards selected. List the sample space.

{

(clubs, clubs), (clubs, diamonds), (clubds, hearts), (clubs, spades),

(diamonds, clubs), (diamonds, diamonds), (diamonds, hearts), (diamonds, spades),

(hearts, clubs), (hearts, diamonds), (hearts, hearts), (hearts, spades),

(spades, clubs), (spades, diamonds), (spades, hearts), (spades, spades)

}

b) Suppose the outcome of interest is the denomination of each of the two selected cards. How many outcomes would be containedin the sample space?

13 x 13 = 169

Ans: 169

c) what is the probability of selecting two face cards?

One card is selected from each deck. For two face cards, one face card is to be selected from each deck.

Number of favorable outcomes = 1

Size of sample space = 169

Probability = 1/169

Ans: 1/169

d) What is the probability that the same suit is selected from each deck?
In answer of part a, there are 4 outcomes which have same suit from each deck.

Number of suits = 4

Total number of possible outcomes = 4 x 4 = 16

Probability = number of favorable outcomes/size of sample space

= 4/16

= 1/4

Ans: 1/4

e) what is the probability of selecting two hearts or two 7's?

P(two hearts) = 1/169

P(two 7's) = 1/169

P(two hearts or two 7's) = 1/169 + 1/169 = 2/169

Ans: 2/169

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Jessy

@jesss.

Stunner

+ 7

Posted: 14 years ago

#283

great idea! I hope I can be of any help to anyone here

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maryam

@aishu_fan

Voyager

Posted: 14 years ago

#284

please please please please help

what are some examples of
variable INTERVAL : (postive and negative reinforcement)
fixed RATIO (positive and negative reinforcement)
and variable RATIO (positive and negative reinforcement)

for ap psych

Edited by aishu_fan - 14 years ago

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akhl

@akhl

Dazzler

Posted: 14 years ago

#285

please please please please help

what are some examples of
variable INTERVAL : (postive and negative reinforcement)
fixed RATIO (positive and negative reinforcement)
and variable RATIO (positive and negative reinforcement)

for ap psych

[/QUOTE

Variable interval

1. A child's room is inspected after varying number of days on different occasions, and the child is awarded with a chocolte if the room is found to be clean. (Positive reinforcement)

2. Boss inspects the work done after unpredictable number of days and punishes the erring employees. (Negative reinforcement)

Fixed ratio:

1. An insurance agent gets bonus every time he makes 20 new customers. (Positive reinforcement)

2. A student is given detention whenever he violates three rules of the school. (Negative reinforcement)

Variable ratio:

1. The employees in an organization are awarded after they exhibit varying number of desired behaviors on different occasions. (Positive reinforcement)

2. A student is punished after violating different numbers of rules in different months. (Negative reinforcement)

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Shree

@shree93

Dazzler

Posted: 14 years ago

#286

Its a chemistry problem, and I am a little confused:

Select the options below that are correct for diamagnetism and paramagnetism.

Check all that apply.

	Diamagnetic properties are due to the presence of some unpaired electrons.
	Diamagnetism is observable in substances with a symmetric electronic structure.
	Diamagnetism is observed as repulsion in a magnetic field.
	Most elements and some compounds are paramagnetic.
	Individual magnetic moments in paramagnetic substances cancel each other.
	Most compounds and some elements are diamagnetic.