Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Statistics and Probability Expert

problem 1) A school wishes to estimate average weight of students in the 6th grade. Standard deviation of population is known to be 15 lbs. Random sample of 8 values is chosen; the values in lbs are 8.5, 9.6, 10.7, 10.9, 11.5, 11.6, 12.8 and 9.3. find out the 90% and 95% confidence interval for the population mean.

b) Examination was given to two groups of 40 female and 50 male students, respectively. Female mean grade was 74 and S.D. of 8, while male mean grade was 76 with S.D. of 7. Determine the 95% confidence interval for the difference in population mean grade between male and female students i.e.    

problem 2)a) To estimate average weekly income of unskilled workers in a large city the investigator collected weekly income data from a random sample of 25 unskilled workers. Sample mean and S.D. are found to be Rs. 927 and Rs. 15 respectively. Test hypothesis that average income (weekly) of the workers is less than Rs. 1025. Use 5% level of significance.

b) Metro discount store has always prided itself on customer service. Store hopes that all metro stores are providing the same level of service from coast to coast, so they have surveyed some customers. In the Karachi region, a random sample of 97 customers yielded an average overall satisfaction rating of 8.8 out of 10 and the sample standard deviation was 0.7. In the Lahore region, a random sample of 84 customers resulted in an average rating of 9.0 and the sample standard deviation was 0.6. Can Metro conclude, at α = 0.05, that the levels of customer satisfaction in the two markets are significantly different?

problem 3)a) State and describe Statistical Process Control. Define various control charts.

b) quality control effort is being attempted for a process where large steel plates are being manufactured and surface defects are of concern.

The goal is to set up a quality control chart for the number of defects per plate. The data are as follows:

Sample Plate    Number of Defects     Sample Plate    Number of Defects
1                                 4                         11                1
2                                 2                         12                2
3                                 1                         13                2
4                                3                          14                3
5                                0                          15                1
6                                4                          16                4
7                                5                          17                3
8                                3                          18                2
9                                2                          19                1
10                              2                          20                3

Set up the appropriate control chart, using this sample information. Does the process appear to be in control?

problem 4)a) The following table shows the likings of three colors pink, white and blue in a sample of 200 males and females.

Colors             Sex
             Males    Females
Pink        20         40
White     40         20
Blue       60         20

Test whether is there any relation between sex and color. Use α = 0.05.

b) Fauji Fertilizer Company is making fertilizer of three types. Yield of wheat (in kg/acre) after using each fertilizer (5 kg) during last 6 years as follow:

Urea                   52    57    59    54    58    59
Phosphorus        42    45    49    41    43    45
Nitrogen             79    78    77    74    73    76

Using ANOVA technique, Is there any major difference in these fertilizers?

problem 5) Sprite soft drink Company is studying the effect of its latest advertising campaign. People chosen at random were called and asked how many cans of Sprite they had bought in the past week and how many Sprite advertisement 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

i) Fit and interpret the equation Y = a + bX

ii) Also test the regression coefficient i.e., b = 0

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M95997

Have any Question? 


Related Questions in Statistics and Probability

A real number x is randomly chosen from the interval 010

A real number X is randomly chosen from the interval [0,10], dividing the interval into a left and a right side. Find the probability that the left side is at least four times as big as the right.

A history class is comprised of 8 female and 6 male

A history class is comprised of 8 female and 6 male students. If the instructor of the class randomly chooses 5 students from the class for an oral exam, what is the probability that 2 female students and 3 male students ...

A professor has learned that four students in her class of

A professor has learned that four students in her class of 18 will cheat on the exam. She decides to focus her attention on seven randomly chosen students during the exam. a. What is the probability that she finds at lea ...

A box of teddy grahams chocolate cookies is supposed to

A box of Teddy Grahams chocolate cookies is supposed to weigh 250 grams. There is some variation in weight from box to box. The box contents are Normally distributed with an unknown mean and a known standard deviation of ...

A random sample of the price of gasoline from 40 gas

A random sample of the price of gasoline from 40 gas stations in a region gives the statistics below. Complete parts a) and b). ybar = $3.79, s = $0.27 a) Find a 95% confidence interval for the mean price of regular gaso ...

Your statistics teacher knowing the power of sampling

Your statistics teacher, knowing the power of sampling, decides to use only 3 of your 5 quiz grades in assigning your grade for the course, chosen at random. Your quiz average using all 5 quizzes is 81.6, with a standard ...

The manager of a pizza chain in albuquerque new mexico

The manager of a pizza chain in Albuquerque, New Mexico, wants to determine the average size of their advertised 16-inch pizzas. She takes a random sample of 25 pizzas and records their mean and standard deviation as 16. ...

Hadco construction preventive maintenance strategyhadco

HADCO Construction Preventive Maintenance Strategy Hadco Construction is a major contractor for large-scale residential, commercial and government projects.  It operates a fleet of heavy duty construction equipment, for ...

Prove that the boundary of a simplex s is the set of all

Prove that the boundary of a simplex S is the set of all the points y in S whose barycentric coordinate representation has at least one zero coordinate.

A spinoff of the anti-war and civil rights movements of the

A spinoff of the anti-war and civil rights movements of the 1960s that affected women was? increased desire to return to the security of homes and families decreased political involvement. the birth of the women's libera ...

  • 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