Cml 1320

# Cml 1320 - Question 1 1 out of 1 points Which of the...

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Question 1 1 out of 1 points Which of the following is/are assumptions underlying the test for the equality of two variances? Selected Answer: 4. 1 and 2 Correct Answer: 4. 1 and 2 Question 2 0 out of 2 points A public opinion survey wished to determine if support for new tree clearing laws differed between metropolitan (M) and regional (R) areas. Of the 620 metropolitan households interviewed, 440 indicated they supported the tree clearing laws, while only 220 of the 390 regional households indicated support. Construct a 90% confidence interval for the difference between the proportions of metropolitan and regional households favouring the new laws. Write the difference as M - R and state the lower limit correct to 3 decimal places. Selected Answer: 0.096 Correct Answer: 0.095 .095 Question 3 2.5 out of 5 points A local real estate agent wished to determine whether there was a difference between the mean sale price of houses in the suburbs of Toowong and St Lucia. However, first she needed to check whether it would be appropriate to use a pooled variance t test. A sample of 25 properties sold during the last month in Toowong yielded an average sale price of \$225500 with a standard deviation of \$32600, while a sample of 16 properties sold in St Lucia during the last month yielded an average sale price of \$247900 with a standard deviation of \$48300. Assume that 5% is an appropriate level of significance for the test of equality of the variances. 1. State the direction of the alternative hypothesis Ho: Variance(T) = variance (StL) H1: Variance(T) [a] variance (StL) Type gt (greater than), ge (greater than or equal to), lt (less than), le (less than or equal to) or ne (not equal to) as appropriate in the box.2. Calculate the test statistic, using the data

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on Toowong's sale prices in the numerator. Report your answer correct to three decimal places. [b] Use the tables to determine the bounds on the p-value for the test. Report : 3. the lower bound [c] , and 4. the upper bound [d] For where the upper bound or lower bound isoutside the values of the tables: if the lower bound is outside the values of the tables, write lt in box 3 ; or if the upper bound is outside the values of the tables, write gt in box 4 . 5. Is the null hypothesis rejected for this test? Type yes or no. [e] 6. Hence, on the basis of this test, is a pooled variance t test appropriate to analyse the difference in the sale price of houses? Type yes or no. [f]

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Question 4 3 out of 5 points A sociologist wished to determine whether there existed a relationship between socioeconomic status and job satisfaction. Job satisfaction
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## This note was uploaded on 10/21/2009 for the course ECON 1320 taught by Professor John during the Three '08 term at Queensland.

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Cml 1320 - Question 1 1 out of 1 points Which of the...

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