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(a) The starting salary of Bachelor of Business graduates in Australia is known to be normally distributed. An Australian university claims that the average starting salary of its graduates has increased since 2017. The average salary in 2017 was $55,000. A sample of 36 graduates were chosen from the batch of 2021. The average salary and the standard deviation in the sample was found to be $56,600 and $4,800 respectively. A prospective student wishes to investigate the University's claim at 1% level of significance. Use the following 6 step procedure to arrive at your conclusion.Step 1. Statement of the hypotheses Step 2. Test statistic and the standardised test statistic (0.5 mark)Step 3. Level of significance (0.5 mark)Step 4. Decision rule (2 marks)Step 5. Computation of the value of the test statistic Step 6. Conclusion
(b) Consider the same question in part (a). Suppose that the population standard deviation is known to be $4.500. Using this additional information repeat the test at the 1% level of significance that the average salary has increased? Answer the following questions to arrive at your conclusion.I. Test statistic and its sampling distribution II. Discuss whether there is change in the test statistic and/or its sampling distribution compared to part (a)III. Decision rule based on the standardised test statistic IV. value of the test statistic and Conclusion
The average 1-ounce chocolate chip cookie contains 110 calories. A random sample of 15 different brands of 1-ounce chocolate chip cookies results in the following calorie amounts. At a=0.01 level
Population Variation = 84.4-0.13×diversity. How much of the variation is explained by diversity? How much of the variation is explained by diversity?
The statistics showed that students studied an average of 20 hours per week with a standard deviation of 10 hours. What is the probability that a sample mean would exceed 20 hours per week?
For a regression equation, "cancellations" is my dependent variable and I want to know how many cancellations will be at 6pm since hour is my independent variable.
the results of a recent poll on the preference of shoppers regarding two products are shown below.shoppers
A company that manufactures video cameras produces a basic model and a deluxe model.
The Institute for Operations Research and the Management Sciences
q1. suppose that we will randomly select a sample of 64 measurements from a population having a mean equal to 20 and a
Write a MATLAB program to calculate the probability.- Note you will have to specify the mean and variance of the Gaussian random variable.
The following values of shear strength (in tons per square foot) were determined by unconfined compression tests of soil from Waukell Creek, California
The owner of a shopping mall studied the shopping habits of his customers. In order to estimate the mean time spent by shoppers, a random sample
Use a 90% confidence interval to estimate the true proportion of research papers that receive financial aid.
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