Written Assignment 2 Essay

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1 (a) Use Minitab to produce some numerical summaries for both samples (you may want to refer to the workshop sheet from week 9 in semester 1 to help you with this). In your solutions, copy and complete the table below:

n
Mean
St. dev.
LQ
Median
UQ
Athenia
135
1756
69
1706
1754
1803
Olympic
150
1733
101
1670
1731
1803

(b) Let X1 be the cost of a two week stay with Athenia in September, and let X2 be the cost of a two week stay with Olympic in September. Assume that both X1 and X2 follow a Normal distribution, with means and standard deviations as given in the table above.
Let A be upper quartile cost of a two week stay with Athenia. For a randomly chosen customer with Athenia and a randomly chosen customer with Olympic, find P(X1 > A) and P(X2 > A), respectively. Comment.

P(X1>A)
P(X1>1803) = 1-P (Z<1803-1755.9/69) = 1- P (Z<0.6819) = 1-0.7517 = 0.2483
P(X2>A)
P(X2>1803) = 1-P (Z<1803-1733.3/100.996) = 1-P (Z<0.69) = 1- 0.7549 = 0.2451

The probability for the cost of a two week stay with Athenia in September that is higher than £1803 is higher than that of the Olympic. So, it can be seen that Olympic has a higher probability to offer cheap luxury accommodation.

(c) Using your answers to parts (a) and (b), compare and contrast the costs of renting a luxury apartment with these two companies.

To compare Athenia and Olympic, we can see that for the lower quartile range for Athenia (£1706) is higher than that of Olympic (£1671). As well as for the mean and median, Olympics’ are cheaper than Athenias’. Also, from (b), we can see that the probability for getting higher than £1803, Athenia’s one is higher than Olympic’s. So, these show the cost of renting a luxury apartment with Olympic is cheaper than Athenia.

(d) Now compare the costs between the two companies more formally by performing an appropriate hypothesis test. Remember to clearly state your null and alternative hypotheses, and make sure you explain your findings clearly, in plain English.
[You may use Minitab to perform this hypothesis test, if you wish, although full marks can also be achieved by working through this question by hand]

Athenia:
Null and alternate hypotheses:

H0: µ = £ 1756

H1: µ ≠ £1756

2 (a) Produce a scatterplot of these data, and comment. [You may use Minitab for your plot, if you wish]

(b) Calculate Sx1y, Sx1x1 and Syy. You may use the following summaries:

¯x1 = 6353.214 ¯y = 6290.714

∑x²1 = 582613061 Ʃ y² = 589703770 Ʃx1y = 578290105

Sx1y = 578290105-14x6353.214x6290.714 = 18762573.43

Sx1x1 = 582613061 -14x6353.214x6353.214
= 17526467.18
Syy = 589703770- 14x6290.714x6290.714 = 35680613.18

2 (c) Use your answers to part (b) to estimate the simple linear regression equation Y = β0 + β1X1 + ǫ, and superimpose your regression line on the scatterplot in part (a).

β1= Sx1y/Sx1x1= 18762573.43/17526467.18 = 1.07 β0 = ˉy- β1ˉx1 = 6290.714 – 1.0705x6353.214 = -510.58 ≈ -511 Thus, the regression equation is: Y = -511+ 1.07X1 + ǫ

(d) Enter the data from the table above into two separate columns of a Minitab worksheet. Now use Minitab to perform a simple linear regression of Y on X1 to confirm your answer to part (c). In your solutions,
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