Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

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)?

prepare a few sentences describeing 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)? prepare a few sentences describeing 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.

3. Suppose the weight of eggs produced by Henly Farms has a mean of 59.7 g. with a standard deviation of 3.4 g.  Find the probability that a carton of a dozen eggs will weigh less than 727 g.

4. Magazine Marketers is holding a sweepstakes. They list the following prizes and the probability of winning the prize:

864_Probability of winnin prize.jpg

To enter the sweepstakes, you must pay $1 for postage.   Find the expected profit for someone entering this sweepstakes.

5. Given below are the birth weights of babies born to mothers who took special vitamin supplements while pregnant:

3.13    4.37    3.93    4.33    3.39    3.68    4.68    3.52
3.02    4.29    2.47    4.13    4.47    3.22    3.43    2.54

a. Make a 99% confidence interval for the mean weight of babies whose mothers take vitamin supplements.

b. Do a hypothesis test to determine if these babies weight is more than the mean weight for the population of all babies which is 3.39 kg using α = .005

c. In a short paragraph, describe the relationship between your answer to part (a) and your answer to part (b).

6. In a study of the effectiveness of a new pain killer, 46 out of 821 patients tested reported experiencing side effects.  Use α = 0.01 significance level to determine if the proportion who experience side effects from this drug is lower than the 7.8% rate of side effects for the older version of this medication.

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M91712

Have any Question? 


Related Questions in Statistics and Probability

A web search engine model - suppose after we enter some

A Web Search Engine Model - Suppose after we enter some keywords into our web search engine it finds five pages that contain those keywords. We will call these pages A, B, C, D, and E. The engine would like to rank the p ...

What sources can you find on the presence on the vikings in

What sources can you find on the presence on the Vikings in North America? What do we know about those Vikings who may have crossed the Atlantic five hundred or more years before Columbus? Look especially for very recent ...

Letnbspnbspbe a sequence of iid random variables with

Let   be a sequence of IID random variables with finite mean and variance. Show that the sequence of sample means converges in the MS sense.

Prizes and the chances of winning in a sweepstakes are

Prizes and the chances of winning in a sweepstakes are given in the table below. Prize Chances $25,000,000 1 chance in 200,000,000 $450,000 1 chance in 200,000,000 $75,000 1 chance in 20,000,000 $20,000 1 chance in 4,000 ...

After the civil war women were denied any real political

After the Civil War, women were denied any real political voice. And by that I mean they were still denied the right to vote. How did women express their political voice in the Gilded Age and the era in which Populism em ...

A certain light bulb manufacturer makes two types of bulbs

A certain light bulb manufacturer makes two types of bulbs, a low-cost short-life (Stype) bulb and a more expensive long-life (L-type) bulb. The two types of bulbs look identical and so the company must be sure to carefu ...

Recall the random variables ofnbspgiven exercise that are

Recall the random variables of given Exercise that are uniformly distributed over the region  (a) Find the conditional PDFs  (b) Find the conditional CDFs (c) Find    Exercise A pair of random variables, ( X , Y ) , is e ...

Examine if the following is the legitimate probability

Examine if the following is the legitimate probability distribution. x f(x) -4 0.4 1 0.5 8 0.4 14 0.2 Legitimate probability distribution?

Consider a non-linear device such that the output

Consider a non-linear device such that the output is    where the input  consists of a signal plus a noise component,    Determine the mean and autocorrelation function for  when the signal    and the noise   are both Ga ...

Use the value of the line correlation coefficient to

Use the value of the line correlation coefficient to calculate the coefficient of determination. What does this tell you about the explained variation of the data about the regression line? About the unexplained variatio ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate