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

1 what are the advantages and disadvantages of using a

1. What are the advantages and disadvantages of using (a) figures, (b) tables, and (c) text to report the results of experiments in the research report? 2. Differentiate between random sampling and random assignment. Whi ...

Relate the content of this video to the industry segment of

Relate the content of this video to the Industry segment of the external environment by describing which of Porter's Five Competitive Forces is the focus of Outsell Consulting's value proposition? What is the nature of t ...

The centers for disease control and prevention released a

The Centers for Disease Control and Prevention released a report in 1998 that attributed part of the increase in youth smoking in the 1980s to the use of the cartoon character, Joe Camel, in cigarette advertising. Using ...

Your assignment this week is to describe structural

Your assignment this week is to describe structural equation modeling in which you include: (a) a comparison of the first and second generation models of structural equation modeling and their related major assumptions, ...

Suppose there are three bills in a wallet one of the bills

Suppose there are three bills in a wallet. One of the bills is a $1 bill, one is a $5 bill, and the third is a $10 bill. You select two bills at random without replacement from the wallet, and note the value of the bills ...

Part 11 a polling firm conducted a poll of 1000 randomly

Part 1. 1. A polling firm conducted a poll of 1000 randomly selected Georgia Stat University students and discovered that 47% of them voted for Bush in 2004. Nationwide Bush received 51.2% of the popular vote. Using this ...

Assuming data come from a random sample under which of the

Assuming data come from a random sample, under which of the following conditions should we notcalculate a confidence interval for a population mean? A. Population is normally distributed and sample size is 50 individuals ...

The condorcet method the french mathematician condorcet

The Condorcet Method The French mathematician Condorcet proposed the following method for determining a social preference order based on the strict preferences of the individuals in society. A voter i with a strict prefe ...

Assignment- data description collection and sampling1a

Assignment- Data: Description, Collection, and Sampling 1. A study was conducted of the 12-month earnings per share for two categories of airline companies, with the result shown in the chart below. Based on the data, wh ...

1 explain the rationale behind time series designs2

1. Explain the rationale behind time series designs. 2. Describe the simple interrupted time series design. 3. Why is contemporary history a threat to internal validity in a simple interrupted time series design?

  • 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

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

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