Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

problem 1) Seventy data clerks at large manufacturing Co. make average of 27 errors per day normally distributed with the standard deviation of 4. An auditor can check work of 22 clerks per day. Find the probability that the average number of errors in a group of 22 clerks checked on one day is:

i) Fewer than 25?

ii) Greater than 30?

(b) Sui northern gas has find out that cost per 100 sq ft for the residential population electrical service is Rs.3.50 on average, with standard deviation of Rs.0.60. Two different samples are chosen at random, and means are Rs. 3.10 and Rs.3.80 respectively. Assistant in charge of data collection concludes that the second sample is the better one because it is better to overestimate than underestimate the true mean. describe. Is one of the means “better” in some ways, given the true population mean?   

problem 2) A graduate students has just completed first draft of his 700 page dissertation. He has typed his paper himself and is interested in knowing average number of typographical errors per page, but doesn’t want to read the whole paper. Knowing a little bit about business statistics, he selected 40 pages at random to read and found that the average number of typos per page was 4.3 and the sample standard deviation was 1.2 typos per page.

(a) Compute the estimated standard error of the mean.

(b) Construct a 90 percent confidence interval for the true average number of typos per page in his paper.   

problem 3) University bookstore is facing noteworthy competition from off-campus bookstores, and they are considering targeting a specific class in order to retain student business. Bookstore randomly sampled 150 freshmen and 175 sophomores. They found that 46 percent of freshmen and 40 percent of sophomores purchase all of their textbooks at the university bookstore. At α = 0.10, is there a major difference in the proportions of freshman and sophomores who purchase completely at the university bookstore?   

problem 4) Mecca Cola is studying the effect of its latest advertising campaign. People selected at random where called and asked how many cans of Mecca cola they had bought in past week and how many Mecca Cola advertisements they had either read or seen in the past week.

X (number of ads)    3    7    4    2    0    4    1    2
Y (cans purchased)    11    18    9    4    7    6    3    8

(a) Develop the estimating equation that best fits the data

(b) Compute the sample coefficient of determination and the sample coefficient of correlation.   

problem 5) A foods company has added broiled whole chickens to its line of takeout food for busy professionals who do not have time to cook at home. The number of precooked chickens sold in the first 7 weeks is:

Week        1    2    3    4    5    6    7
Sales        41    52    79    76    72    59    41

(a) Determine the linear regression line that best fits these data

(b) find out the expected number of sales for week 8

(c) Based on the estimate in part (b) and the available data, does the regression accurately describe the sales trend for this item?

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M95897

Have any Question? 


Related Questions in Statistics and Probability

The percentage of people who recycle their old phone books

The percentage of people who recycle their old phone books is 15.8% on average. If 240 people are randomly selected, what is the probability that more than 20% of them recycle their phone books?

1 distinguish between theory model and hypothesis2 describe

1. Distinguish between theory, model, and hypothesis. 2. Describe how researchers use induction versus deduction to generate research hypotheses. 3. Describe the process by which hypotheses are developed and tested.

One of the initial clinical trials of the anti-math anxiety

One of the initial clinical trials of the anti-math anxiety drug SHOVITALL TM tested for the presence of headaches as a side effect. In the trial, 450 subjects were treated with 80mg of the drug, and 2.2% of the subjects ...

Discuss how a human rights approach may aid or obstruct the

Discuss how a Human Rights Approach may aid or obstruct the resolution of these three themes: 1. Poverty 2. The Syrian Refugee crisis 3. The death penalty For each theme, please make sure you discuss the human rights iss ...

Historically 25 of all students taking an statistics course

Historically 25% of all students taking an statistics course have failed (i.e. receive a grade below C). Professor Han thinks that she has a better method of teacher statistics to business students. She is given a random ...

Question the volume of soft drink in plastic bottles is a

Question: The volume of soft drink in plastic bottles is a normal random variable with mean 16 ounces and standard deviation 0.6 ounces. a.) If a bottle is selected at random, find the probability that it contains more t ...

The department of education would like to determine if

The Department of Education would like to determine if there are gender differences in the performance of twins on the state mandated mathematics examination. As a result, they have collected data on twelve sets of twins ...

Suppose you have a stock portfolio where 28 of the stocks

Suppose you have a stock portfolio where 28% of the stocks earned a return of 12.2%, 12% earned a return of 15.1%, 24% of the stocks earned a return of 0%, 18% of the stocks earned a return of -1.5%, and 18% of the firms ...

Carter motor company claims that its new sedan the libra

Carter Motor Company claims that its new sedan, the Libra, will average better than 24 miles per gallon in the city. Use μ, the true average mileage of the Libra. Express the null hypothesis and the alternative hypothesi ...

Locate one article presenting research using polynomial

Locate one article presenting research using polynomial regression. Your task now is to critique the appropriateness, utility, alternatives, strengths, and weaknesses of the use of statistics to support the hypotheses of ...

  • 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