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

Suppose that a population of size 3n is partitioned into

Suppose that a population of size 3n is partitioned into three subsets: n contractors, n carpenters, and n plumbers. Each person in this population has two preference relations: a preference relation over each one of the ...

250 -300 wordsexplain the history behind the black soldier

250 -300 words Explain the history behind the Black Soldier of the Civil War In this forum look beyond the book for information on specific units, soldiers and even the reasons for why Lincoln allowed the African America ...

Suppose that you wanted to study children who have down

Suppose that you wanted to study children who have Down syndrome. How might you use cluster sampling to obtain a probability sample of children with Down syndrome in your state?

Question please show your work by making a table fornbspd

Question: (Please show your work by making a table for  d and d-square) A motivational program was designed to increase the number of hours each student who took it studied per week. Eight randomly selected students were ...

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 ...

Data interpretationresearch reportyour taskwrite a report

Data Interpretation Research Report Your task: Write a report on the statistical relationship that you find between the stock price of the company that you have been assigned and the following three variables: the FTSE, ...

Random and independent samples of 80 recent prime time

Random and independent samples of 80 recent prime time airings from each of two major networks have been considered. The first network aired a mean of 110.7  commercials during prime time, with a standard deviation of 4. ...

In a prospective study data collected extensive information

In a prospective study, Data collected extensive information on incidence of coronary heart disease (CHD) among smoker and non-smoker individuals. The table below summarizes the results Risk factor Cases of  CHD Non case ...

Consider the extensive-form game and the scenario shown in

Consider the extensive-form game and the scenario shown in given Figure. a. Compute belief probabilities that are consistent with this scenario. b. For each player, at each of his information states, compute the sequenti ...

You are interested in using linear regression to test

You are interested in using linear regression to test whether drinking a protein shake improves weightlifting performance. From a sample of 200 college students, you estimate a linear regression with WEIGHTLIFT as the de ...

  • 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