# Cool Toast

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### Statistics Confidence level problem?

There were 4 parts to this question, and I got the actual equation parts, but I'm confused by the other two.

A Gallup Poll in November 2008 found that 59% of the people in its sample said “Yes” when asked, “Would you like to lose weight?” Gallup announced: “For results based on the total sample of national adults, one can say with 95% confidence that the margin of (sampling) error (MOE) is 3 percentage points.”

1) Explain what the margin of error means in this setting.

2) As Gallup indicates, the 3 percentage point margin of error for this poll includes only sampling variability (what they call “sampling error”). What other potential sources of error (Gallup calls these “nonsampling errors”) could affect the accuracy of the 59% estimate?

2 AnswersMathematics8 years ago### Physics 3 system Equation Problem?

1) The suspended 2.1 kg mass on the right is moving up, the 2 kg mass slides down the ramp, and the suspended 8.7 kg mass on the left is moving down. The coeﬃcient of friction between the block and the ramp is 0.18. The acceleration of gravity is 9.8 m/s^2. The pulleys are massless and frictionless.

1). What is the acceleration of the three blocksystem? Answer in units of m/s^2

2) What is the tension in the cord connected to the 2.1 kg block? Answer in units of N

3) What is the tension in the cord connected to the 8.7 kg block? Answer in units of N

Image: http://img854.imageshack.us/img854/9223/82382731.p...

2 AnswersPhysics8 years ago### Physics Vector Problem?

A car travels 26.7 km due north and then 28.9 km in a direction φ = 48.4◦ west of north. Calculate the direction of the car’s resultant displacement, measured counterclockwise from the northerly direction. Answer in units of degrees.

I tried to do this 3 different ways and I got 115.2011236, -115.2, and 64.79887 as my answers, none of which are correct...

1 AnswerPhysics8 years ago### Physics Vector Problems?

A car travels 26.7 km due north and then 28.9 km in a direction φ = 48.4◦ west of north. Find the magnitude of the car’s resultant displacement. Answer in units of km.

So I tried to use the Pythagorean theorem (a^2 + b^2 = c^2) using 26.7 as a and 28.9 as b, and got c to equal 39.3, but that answer isn't right...I can't figure out how to do this.

2 AnswersPhysics8 years ago### Physics Kinematics Problem?

A ball is dropped from rest at point O. After falling for some time, it passes by a window of height 3.1 m and it does so in 0.23 s. The ball accelerates all the way down; let vA be its speed as it passes the window’s top A and vB its speed as it passes the window’s bottom The acceleration of gravity is 9.8 m/s^2 .Calculate the speed vA at which the ball passes the window’s top. Answer in units of m/s

1 AnswerPhysics8 years ago### Can a 16 year old girl and a 22 year old girl date as long as there are no sexual relations?

I.e. they consider themselves to be dating and they'll hug and kiss, but haven't and don't plan on having sex. Is it legal? (For Pennsylvania, USA)

5 AnswersLaw & Ethics8 years ago### How could you distinguish the following white artificial sweetener powders using flame tests?

How could you distinguish the following white artificial sweetener powders using flame

tests and cobalt glass (which blocks out yellow light): Equal {C14H18N2O5, a non-ionic compound}, Ace-K {KC3H4NO4S} and Sweet ‘N Low {Ca(C7H4NO3S)2 }?

1 AnswerChemistry9 years ago### What do these Japanese characters read as in English?

Could someone please translate this?

2 AnswersLanguages9 years ago### What changes did the Germanic people make to the Roman political system duringthe Early Middle Ages (450-1000)?

What changes did the Germanic people make to the Roman political system during the Early Middle Ages (450-1000)?

2 AnswersHistory9 years ago### List two coterminal angles of Pi/12 (one positive and one negative)?

How do I find two coterminal angles of π/12?

1 AnswerMathematics9 years ago### Pre-calc homework help? Equation for paying a loan?

The problem is that someone has $12500 to pay off, annually, for 30 years, with a 6.5% interest rate I believe.

How do I find out how much money, in total, they will end up paying, with the interest?

2 AnswersMathematics9 years ago### How do you pronounce the name "Mabel Clouseau"?

2 AnswersLanguages9 years ago### What is the romaji for "I am not a banana" in Japanese?

3 AnswersLanguages10 years ago