Ask Statistics and Probability Expert

Attempt all the problems.

Section-A

problem1) Last year television stations WXYZ’s share of 11pm news audience was approximately equal to 25%. Station’s management believes that present audience share is higher than last year’s 25% figure. In an attempt to substantiate this belief, station surveyed 400 11pm viewers and found that 146 watched WXYZ. Set up the null and alternative hypothesis and test the same at 5% level of significance. What is your conclusion?

problem2)  A retailer that sells home entertainment systems accumulated 10451 sales invoices during the previous year. The total of the sales amount on these invoices as claimed by the company is Rs.63,84,675. In order to estimate the true total sales for last year, an independent auditor randomly selects 350 of the invoices and determines the actual sales amounts by contacting the purchasers. The mean and standard deviation of the 350 samples sales amounts are Rs. 532 and standard deviation 168. Find the point and interval estimate given that a 95% confidence is required.  Do you think that the sales invoice claimed by the company is correct?

problem3) One of the problems on the Business Week subscriber study was, “In the past 12 months when travelling for business, what type of airline ticket did you purchase most often”. The data obtained are shown in the following table.

                                                               Type of Flight
Type of Ticket                          Domestic flights    International flights
First Class                                           29                    22
Business / Executive class                   95                   121
Full fare economy /coach class            518                 135

Based on the above can it be concluded that type of ticket is dependent on the type of flight taken. Use 5% level of significance.

problem4) To study effect of temperature on yield in a chemical process, five batches were produced at each of three temperature levels. The results follow. Construct an analysis of variance table. Use a 5% level of significance to test whether the temperature level has an effect on the mean yield of the process.

                             Yield
Temperature   
50degC         34    24    36    39    32
60degC         30    31    34    23    27
70degC         23    28    28    30    31

SECTION-B

Case Study

A research project was undertaken to determine if there is relationship between the years of experience on the job (A) and efficiency rating of employees (B). The purpose of the study was to predict the efficiency rating of the employee. The sample results are as follows:

Years of Job (A)         1    20    6    8    2    1    14    8    4    6
Efficiency rating (B)     6    5     3    5     2    2     4     3    3    4

a) Which variable is the dependent variable?

b) Find if there is correlation between the two variables and test the correlation coefficient. (Use 5% level of type I error) 

c) Estimate the linear regression model. Do you think that the regression coefficient will be significant at 5% level of significance? Give reasons.

d) Do you think overall regression model will be significant. Give reasons.

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M93232
  • Price:- $40

Guranteed 36 Hours Delivery, In Price:- $40

Have any Question?


Related Questions in Statistics and Probability

Introduction to epidemiology assignment -assignment should

Introduction to Epidemiology Assignment - Assignment should be typed, with adequate space left between questions. Read the following paper, and answer the questions below: Sundquist K., Qvist J. Johansson SE., Sundquist ...

Question 1 many high school students take the ap tests in

Question 1. Many high school students take the AP tests in different subject areas. In 2007, of the 144,796 students who took the biology exam 84,199 of them were female. In that same year,of the 211,693 students who too ...

Basic statisticsactivity 1define the following terms1

BASIC STATISTICS Activity 1 Define the following terms: 1. Statistics 2. Descriptive Statistics 3. Inferential Statistics 4. Population 5. Sample 6. Quantitative Data 7. Discrete Variable 8. Continuous Variable 9. Qualit ...

Question 1below you are given the examination scores of 20

Question 1 Below you are given the examination scores of 20 students (data set also provided in accompanying MS Excel file). 52 99 92 86 84 63 72 76 95 88 92 58 65 79 80 90 75 74 56 99 a. Construct a frequency distributi ...

Question 1 assume you have noted the following prices for

Question: 1. Assume you have noted the following prices for paperback books and the number of pages that each book contains. Develop a least-squares estimated regression line. i. Compute the coefficient of determination ...

Question 1 a sample of 81 account balances of a credit

Question 1: A sample of 81 account balances of a credit company showed an average balance of $1,200 with a standard deviation of $126. 1. Formulate the hypotheses that can be used to determine whether the mean of all acc ...

5 of females smoke cigarettes what is the probability that

5% of females smoke cigarettes. What is the probability that the proportion of smokers in a sample of 865 females would be greater than 3%

Armstrong faber produces a standard number-two pencil

Armstrong Faber produces a standard number-two pencil called Ultra-Lite. The demand for Ultra-Lite has been fairly stable over the past ten years. On average, Armstrong Faber has sold 457,000 pencils each year. Furthermo ...

Sppose a and b are collectively exhaustive in addition pa

Suppose A and B are collectively exhaustive. In addition, P(A) = 0.2 and P(B) = 0.8. Suppose C and D are both mutually exclusive and collectively exhaustive. Further, P(C|A) = 0.7 and P(D|B) = 0.5. What are P(C) and P(D) ...

The time to complete 1 construction project for company a

The time to complete 1 construction project for company A is exponentially distributed with a mean of 1 year. Therefore: (a) What is the probability that a project will be finished in one and half years? (b) What is the ...

  • 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

Why might a bank avoid the use of interest rate swaps even

Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate

Describe the difference between zero coupon bonds and

Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p

Compute the present value of an annuity of 880 per year

Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As

Compute the present value of an 1150 payment made in ten

Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int

Compute the present value of an annuity of 699 per year

Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As