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

1 what is the minimum reliability coefficient that

1. What is the minimum reliability coefficient that researchers consider acceptable? Why do researchers use this minimum criterion for reliability? 2. For what kind of measure is it appropriate to examine test-retest rel ...

An employer interviews 9 people for 6 computer programming

An employer interviews 9 people for 6 computer programming positions in a company, and 4 of the 9 people are men. If all 9 are qualified, in how many ways can the employer fill the computer programming positions if exact ...

The following tables depict the preferences of three

The following tables depict the preferences of three universities regarding a set of applicants, and the preferences of the applicants regarding the universities. Every university also has a specified quota for the numbe ...

Let a be a matching not necessarily stable and let maom be

Let A be a matching (not necessarily stable), and let MA,Om be the set of men who prefer the women to whom they are matched under A to the women to whom they are matched under the men's courtship matching Om. (a) Prove t ...

Measures of central tendency summative taskon a separate

Measures of Central Tendency Summative Task On a separate paper hand out the solution of the two parts of the investigation: Part One - Use the given data set to solve the following problems: 50, 55, 60, 60,70, 80 A. Fin ...

To prepare for this assignmentreview this weeks learning

To prepare for this Assignment: Review this week's Learning Resources and the  Central Tendency and Variability  media program. For additional support, review the  Skill Builder: Visual Displays for Categorical Variables ...

Imagine that the equation for predicting y from x is y 112

Imagine that the equation for predicting y from x is y = 1.12 - .47x. How would you use this equation to predict a particular individual's score?

Let x0 x1 x2nbspbe three vectors in rn prove that these

Let x 0 , x 1 , x 2  be three vectors in R n . Prove that these vectors are affine independent if and only if none of them is a convex combination of the other two.

What was the highest point of the popes power and what was

What was the highest point of the pope's power and what was the lowest point?

1 here are several situations in which there is an

1. Here are several situations in which there is an incorrect application of the ideas in statistical inference. Write a sentence or two in each case explaining what is wrong and why it is wrong. (a) A significance test ...

  • 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

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen