Question

In: Statistics and Probability

3) A stock market analyst wants to determine if the recent Hotel C upgrade to 4...

3) A stock market analyst wants to determine if the recent Hotel C upgrade to 4 starts has changed the distribution of shares of the hotel market. The current market share for the existing 3 hotels is shown in table below. The analyst collects data from a random sample of 200 investors. The table below shows the observed investors’ share holdings (fi ). When using this random sample the analyst needs to be 90% confident of test results. The hypothesis to be tested follows:

H0 : Pa =0.25; Pb =0.45; Pc =0.30 ; market shares have remained same

Ha : Pa ≠0.25; Pb ≠0.45; Pc ≠0.30 ; market shares have changed

Hotel

Name

Current Market Share

Observ. Freq fi

A

0.25

50

B

0.45

95

C

0.30

55

Totals

200

  1. Compute the test statistic

B. Has the recent upgrade of Hotel C to 5 stars changed the hotel market composition? Why?

Solutions

Expert Solution

( a )

The following table is obtained:

Categories Observed Expected (fo-fe)2/fe
Category 1 50 200*0.25=50 (50-50)2/50 = 0
Category 2 95 200*0.45=90 (95-90)2/90 = 0.278
Category 3 55 200*0.30=60 (55-60)2/60 = 0.417
Sum = 200 200 0.694

from the above calculated table

Test Statistics

Rejection Region

Based on the information provided, the significance level is α = 0.10, the number of degrees of freedom is df = 3−1 = 2, so then the rejection region for this test is R = { χ2:χ2 > 4.605}.

Decision about the null hypothesis

Since it is observed that χ2 = 0.694 ≤ χc2 ​= 4.605, it is then concluded that the null hypothesis is not rejected.

( b )

No the recent upgrade of Hotel C to 5 stars does not  changed the hotel market composition . Because the null hypothesis is not rejected. so market shares have remained same and also Hotel C.


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