Numerade

Questions asked

INSTANT ANSWER

A letter is drawn at random from the word PENNSYLVANIA. What is the sample space for this experiment (assume that you cannot tell duplicate letters apart)?

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To be “fully charged”, Tom Rath recommends Group of answer choices a) working while standing up or walking b) taking breaks from work and getting up every hour c) drinking fruit juice instead of coffee c) setting SMART goals at work

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To be “fully charged”, Tom Rath recommends

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People who did not become readily helpless in Seligman ́s laboratory tended to believe Group of answer choices a) that setbacks are temporary and can change b) that they have no control over their environment c) that setbacks are general and permanent d) that problems can undermine every aspect of their lives

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ANSWERED

Vincenzo Zaccaro

Numerade educator

hree points are chosen at random on the circumference of a circle. What is the probability that they will lie on a semicircle? (First, it might help to notice that two points always lie in a semicircle!)

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Let Y be a random variable that is exponentially distributed with EpY q “ 25. (a) What is the pdf of Y ? (b) What is the variance of Y ? (c) Suppose Y models how long you have to wait for something. And suppose you have already waited for 15 minutes? How much longer do you expect to have to wait?

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Let X be a continuous random variable on the interval r ́1, 1s with pdf ppxq “ 1 ́ |x| – you could think of this as the “poor man’s bell-shaped curve”. (a) What is P p0 ă X ă 1q? (b) What is P p ́ 1 2 ă X ă 1 2 q? (c) What is EpXq (easy)? What is V pXq (less easy)?

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In a political survey with two alternatives, 400 people are interviewed. What margin of error will be reported for this survey (i.e., + or - how many percent? -- assume 95% confidence) In the political survey from the last problem, about how many people will be needed to get the margin of error down to +/- 1%.

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INSTANT ANSWER

In a political survey with two alternatives, 400 people are interviewed. What margin of error will be reported for this survey (i.e., + or - how many percent? -- assume 95% confidence)

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INSTANT ANSWER

Scores on the SAT are approximately normally distributed. One year, the average score on the Math SAT was 500 and the standard deviation was 120. About what percent of the test-takers scored over 600?

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Billy T.