Statistics Problems... Please answer ONLY if you know the right option!! (5 prob

Question

Statistics Problems... Please answer ONLY if you know the right option!! (5 problems in total)

Over the years grades in an introductory statistics course were recorded and showed the following proportions: A 0.20 B 0.30 C 0.30 D = 0.10 and F-0.10 This year there were 200 students in the introductory statistics class and they received the following grades A-56B-74C=60D=9and F-1 To test whether the distribution of grades this year is the same as in the past the x2 statistic is calculated. The component of this x2 statistic corresponding (0-82/Eo 0 (0-E)2/E = 1 O(O-2E 30 (O-E2/E- 30 (O-E)2 /E 11,880.3 (o-B2/E- 11,880.3

Explanation / Answer

Following table shows the calcualtion for expected frequencies and chi sqaure test statistics:

Option first is correct.

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Degree of freedom : df = 5-1 =4

P-value of the test is : 0.0000

So last option is correct.

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First option is correct. All the expected frequencies are greater than 5.

O E=Proporiton*200 (O-E)^2/E A 56 40 6.4 B 74 60 3.266666667 C 60 60 0 D 9 20 6.05 F 1 20 18.05 Total 200 200 33.76666667

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