Statistics: Regression Analysis and Individual Assignment Submission

994 Words Aug 9th, 2013 4 Pages
IBA134 Business Statistics

OUA Study Period 2 (SP2), 2013

Computer Assignment

(Worth 15% of the overall assessment for the unit)

Due date: 5pm (QLD time) on Sunday 11, August 2013

Instructions:

• All numerical calculations and graphs/plots should be done using EXCEL.

• A hard copy of your completed assignment must be submitted electronically with the Griffith OUA Cover Sheet (available in the Assessment section of the unit website) attached as the 1st page of your submission. See instruction on the IBA134 Business Statistics unit website under “Assessment” and “Online submission of assignments using SafeAssign” on the link
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(b) Use five of the above summary measures to represent the summary information in a box plot for each variable.

(c) Compute a numerical summary measure to measure the strength of the relationship between the two variables. Interpret this value.

QUESTION 4

The researcher wishes to estimate the population means for the two variables under consideration using the sample data.

(a) Compute the best point estimates for the mean of the two variables and their standard errors.

(b) Construct a 95% interval estimate for the population mean of each of the two variables.

(c) Explain what would happen to the two interval estimates in 4(b) above if we use a level confidence 90% instead of 95%. Justify your answer by re-calculating the 90% interval estimates for the population mean of the two variables.

QUESTION 5

The researcher wishes to test hypotheses about the population means for the two variables under consideration using the sample data.

(a) The researcher believes that the average television time per week is more than 25 hours. How do you test his believe? Is there any evidence for his believe? Use a 5% level of significance.

(b) The researcher believes that the average debt is less than $150,000. How do you test his

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