Task

1. QUESTION 1 Probability

Show all calculations/reasoning

Guide to marks: 16 marks - (a) 3, (b) 3, (c1) 3, (c 2-5) 1 each, (d) 3

(a) What is a random variable? What are the various types of random variable? Describe the difference between them.

(b) What is meant by the term expected value? What does it measure?

How is it computed for a discrete probability distribution? Give an example of its calculation.

(c ) Consider the following record of daily sales of cars over the last 100 days.

Sales Units (x) Number of days p(x) Exp Value More than Less than

1 20

2 40

3 20

4 10

5 10

Total 100

(1) Copy the above table and complete the missing column figures (note that the last 2 columns refer to cumulative probability distributions). Then answer the following questions highlighting the answers to (3), (4) and (5).

(2) What was the probability of selling 1 or 2 units on any one day?

(3) What were the average daily sales?

(4) What was the probability of selling 3 or more?

(5) What was the probability of selling 4 or less?

(d) The average sales of apples is 5000 with a standard deviation of 500.

(1) What is the probability that sales will be greater than 5500 apples?

(2) What is the probability that sales will be less than 4900 apples?

(3) What is the probability that sales will be less than 4250 apples?

QUESTION 2 Research Question, Constructing data table and calculating probabilities

Guide to marks: 14 marks – (1) 5, (2) 5, (3) 4

The following question involves learning/employing research skills in searching out data on the Internet, presenting it in a well constructed and informative table, and calculating some probabilities showing calculation methods.

1. Search the Internet for the latest figures you can find on the age and sex of the Australian population.

2. Then using Excel, prepare a table of population numbers (not percentages) by sex (in the columns) and age (in the rows). Break age into about 5 standard groups, eg, 0-14, 15-24, 25-54, 55-64, 65 and over. Insert total of each row and each column. Paste the table into Word as a picture.

Give the table a title, and below the table quote the source of the figures.

3. Calculate from the table, showing your calculation methods:

• The probability that any person selected at random from the population is a male.

• The probability that any person selected at random from the population is aged between 15 and 24.

• The joint probability that any person selected at random from the population is a female and aged between 15 and 24.

• The conditional probability that any person selected at random from the population is 25 or over given that the person is a male.

QUESTION 3 Statistical Decision Making and Quality Control

Show all calculations/reasoning

Guide to marks: 20 marks – (a) 3 each for 1,2, and 3, 1 for conclusion, (b) 10

A company wishes to set control limits for monitoring the direct labour time to produce an important product. Over the past the mean time has been 20 hours with a standard deviation of 10 hours and is believed to be normally distributed. The company proposes to collect random samples of 64 observations to monitor labour time.

1. 1If management wishes to establish x ¯ control limits covering the 95% confidence interval, calculate the appropriate UCL and LCL.

2. If management wishes to use smaller samples of 16 observations calculate the control limits covering the 95% confidence interval.

3. Management is considering three alternative procedures in order to maintain tighter control over labour time:

• Sampling more frequently using 16 observations and setting confidence intervals of 90%

• Maintaining 95% confidence intervals and increasing sample size to 64 observations

• Setting 95% confidence intervals and using sample sizes of 36 observations.

Calculate the control limits for each of the 3 alternatives.

Which procedure will provide the narrowest control limits? What are they?

(b)

Hypothesis testing

Company A has invested a great deal of time and money in occupational safety training for its employees and claims its occupational sick days are now below the national average. The national average was found to be 1.5 occupational sick days. per 100 employees with a standard deviation of 0.3 days.

Company A randomly selected 100 employees for the last year and found the sample had a mean of 1.3 occupational sick days which Company A believed supported their claim.

Using hypothesis testing with an alpha level of 0.05 and a 1-tail test, show the null and alternative hypotheses, sketch the distribution showing mean and critical region, and determine whether Company A’s belief is supported.

END OF ASSIGNMENT 1

Rationale

This assessment task covers topics 1 and 2: Probability concepts and distributions, and Statistical decision making and quality control. It has been designed to ensure that you are engaging with the subject content. More specifically, it seeks to assess your ability to:

• apply probability concepts to decision making

• demonstrate problems solving skills in assessing, organising, summarising and interpreting relevant information for decision making

• demonstrate understanding of the application of statistical hypothesis testing to decisions, with particular emphais on quality control.

1. QUESTION 1 Probability

Show all calculations/reasoning

Guide to marks: 16 marks - (a) 3, (b) 3, (c1) 3, (c 2-5) 1 each, (d) 3

(a) What is a random variable? What are the various types of random variable? Describe the difference between them.

(b) What is meant by the term expected value? What does it measure?

How is it computed for a discrete probability distribution? Give an example of its calculation.

(c ) Consider the following record of daily sales of cars over the last 100 days.

Sales Units (x) Number of days p(x) Exp Value More than Less than

1 20

2 40

3 20

4 10

5 10

Total 100

(1) Copy the above table and complete the missing column figures (note that the last 2 columns refer to cumulative probability distributions). Then answer the following questions highlighting the answers to (3), (4) and (5).

(2) What was the probability of selling 1 or 2 units on any one day?

(3) What were the average daily sales?

(4) What was the probability of selling 3 or more?

(5) What was the probability of selling 4 or less?

(d) The average sales of apples is 5000 with a standard deviation of 500.

(1) What is the probability that sales will be greater than 5500 apples?

(2) What is the probability that sales will be less than 4900 apples?

(3) What is the probability that sales will be less than 4250 apples?

QUESTION 2 Research Question, Constructing data table and calculating probabilities

Guide to marks: 14 marks – (1) 5, (2) 5, (3) 4

The following question involves learning/employing research skills in searching out data on the Internet, presenting it in a well constructed and informative table, and calculating some probabilities showing calculation methods.

1. Search the Internet for the latest figures you can find on the age and sex of the Australian population.

2. Then using Excel, prepare a table of population numbers (not percentages) by sex (in the columns) and age (in the rows). Break age into about 5 standard groups, eg, 0-14, 15-24, 25-54, 55-64, 65 and over. Insert total of each row and each column. Paste the table into Word as a picture.

Give the table a title, and below the table quote the source of the figures.

3. Calculate from the table, showing your calculation methods:

• The probability that any person selected at random from the population is a male.

• The probability that any person selected at random from the population is aged between 15 and 24.

• The joint probability that any person selected at random from the population is a female and aged between 15 and 24.

• The conditional probability that any person selected at random from the population is 25 or over given that the person is a male.

QUESTION 3 Statistical Decision Making and Quality Control

Show all calculations/reasoning

Guide to marks: 20 marks – (a) 3 each for 1,2, and 3, 1 for conclusion, (b) 10

A company wishes to set control limits for monitoring the direct labour time to produce an important product. Over the past the mean time has been 20 hours with a standard deviation of 10 hours and is believed to be normally distributed. The company proposes to collect random samples of 64 observations to monitor labour time.

1. 1If management wishes to establish x ¯ control limits covering the 95% confidence interval, calculate the appropriate UCL and LCL.

2. If management wishes to use smaller samples of 16 observations calculate the control limits covering the 95% confidence interval.

3. Management is considering three alternative procedures in order to maintain tighter control over labour time:

• Sampling more frequently using 16 observations and setting confidence intervals of 90%

• Maintaining 95% confidence intervals and increasing sample size to 64 observations

• Setting 95% confidence intervals and using sample sizes of 36 observations.

Calculate the control limits for each of the 3 alternatives.

Which procedure will provide the narrowest control limits? What are they?

(b)

Hypothesis testing

Company A has invested a great deal of time and money in occupational safety training for its employees and claims its occupational sick days are now below the national average. The national average was found to be 1.5 occupational sick days. per 100 employees with a standard deviation of 0.3 days.

Company A randomly selected 100 employees for the last year and found the sample had a mean of 1.3 occupational sick days which Company A believed supported their claim.

Using hypothesis testing with an alpha level of 0.05 and a 1-tail test, show the null and alternative hypotheses, sketch the distribution showing mean and critical region, and determine whether Company A’s belief is supported.

END OF ASSIGNMENT 1

Rationale

This assessment task covers topics 1 and 2: Probability concepts and distributions, and Statistical decision making and quality control. It has been designed to ensure that you are engaging with the subject content. More specifically, it seeks to assess your ability to:

• apply probability concepts to decision making

• demonstrate problems solving skills in assessing, organising, summarising and interpreting relevant information for decision making

• demonstrate understanding of the application of statistical hypothesis testing to decisions, with particular emphais on quality control.

ASSESSMENT BRIEFSubject Code and Title ACCT2000: FINANCIAL ACCOUNTINGAssessment AssignmentIndividual/Group IndividualLength 1000 words (Part B only)Learning Outcomes 4. Understand methods of presenting...Assessment task 3: Response PaperObjective(s): This assessment task addresses the following subject learning objectives (SLOB):1, 2 and 3This assessment task contributes to the development of the following...Competitive Strategy H16006 —S3 / T2 - 2019 Dr Philip Booth - Holmes SydneyHandout 3b: HI6006 ASSIGNMENTS OVERVIEW - VERSION 2Assessment Tasks1. Individual Assignment: Key Strategy Development ToolsDue:...// project topic: Supply chain management augmentation in the retail industry using analytical techniques: conceptual framework** project developed on the topic should include results generating a conceptual...ASSESSMENT BRIEFSubject Code and Name LAW6000 Business and Corporate LawAssessment Assessment 2 Case study analysisIndividual/Group IndividualLength 1500 wordsLearning OutcomesThis assessment addresses...ASSESSMENT BRIEFSubject Code and Title LAW 2002 Introduction to income tax lawAssessment Assessment 4: Case StudyIndividual/Group IndividualLength 1500 wordsLearning Outcomes This case study must be presented...HI5013 – MANAGING ACROSS BORDERSASSESSMENT 1 – INDIVIDUAL ASSIGNMENTWeighting: 20% of total marksDue date: 5pm Friday, week 5Length: Maximum 1,200 wordsPlease choose one of the following topics to discuss:1....**Show All Questions**