statistics, Basic Statistics

1. A search engine site claims that, on average, one out of five visitors clicks on an ad.
(a) If 8 users visit the site, what is the probability that at least three click on an ad?
(b) If 8 users visit the site, what is the probability that less than two of them click on an ad?
(c) If 800 users visit the site, would the probability that less than 200 click on an ad be higher or lower than the answer found in part (b)? Write a few sentences explaining your answer- computations are not required (or desired)
(d) Suppose 90 users visit the site during a particular minute, use the normal approximation to estimate the probability that more than 25 of them click on an ad.
(e) If 900 users visited the site, would the probability that more than 250 of them click on an ad be higher or lower than the answer found in part (d)? Write a few sentences explaining your answer- computations are not required (or desired)

2. Suppose that, overall, 5% of all tax returns are audited by the IRS.
(a) If an accountant has 7 clients for whom she prepared tax returns, what is the probability that less than 3 will be audited?
(b) If the accountant has 30 clients, what is the probability that at least one is audited?
(c) Suppose the accountant prepares 500 returns, use the normal approximation to estimate the probability that more than 20 of the returns are audited.
Posted Date: 3/31/2013 12:44:05 PM | Location :







Related Discussions:- statistics, Assignment Help, Ask Question on statistics, Get Answer, Expert's Help, statistics Discussions

Write discussion on statistics
Your posts are moderated
Related Questions
Agglomerative hierarchical clustering methods/procedures Methods of cluster analysis that start with each individual in the separate cluster and then, in the series of steps, c

Using 1 st order models shown in homework 2 solution determine the probability of coding region in frame two for DNA fragment AGTAGCTTCCAG. Use only parameters provided in the hom

journal entries of a loan swap with different currency

A machine that cuts corks for wine bottles operates in such a way that the distribution of the diameter of the corks produced is well approximated by a normal distribution with mea

Questions In a regression analysis, a nurse researcher found a correlation of .82 between pain relief scores and satisfaction with nursing care.  She also calculated the follow

Stratified Sampling: If the population from which a sample is to be drawn does not constitute a homogenous group, then stratified sampling technique is applied so as to obtain a re

A business starts out with a cash balance of £1,000. It then makes the following transactions: Buys inventory on credit for £500 Sells a non-current asset for £100 cash Sells goods

An experiment succeeds twice as often as it fails. Find the chance that in the next six trials there will be at least four successes

Capital grants Grants that are restricted for the acquisition: structure: renewal of capital assets associated with an accurate program, Refer to GRANTS & OPERATING GRANTS

told my friend I would help on a test, and now, think its beyond me LOL...want to save face, can you help me?