Question

The frequency distribution shows the results of 200 test scores. Are the test scores normally​ distributed?...

The frequency distribution shows the results of 200 test scores. Are the test scores normally​ distributed? Use α=0.01.

Class boundaries

​49.5-58.5

​58.5-67.5

​67.5-76.5

​76.5-85.5

​85.5-94.5

​Frequency, f

202

61

79

35

5

Using a​ chi-square goodness-of-fit​ test, you can​ decide, with some degree of​ certainty, whether a variable is normally distributed. In all​ chi-square tests for​ normality, the null and alternative hypotheses are as follows.

H0​: The test scores have a normal distribution.

Ha​: The test scores do not have a normal distribution.

a) Find the expected frequencies.

b) find the critical value a

c) find the chi-square test statistic

0 0
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Answer #1

Х Class baumala 1, 6803 202 63 3,913 242 10 Gi 58 5 675 5, 88 40953も 2,8352193S 381 Σfa 23 724 382 C less h3.5 ← 58.5 58 5 5o. 257ヶ 49s-58 s Z ever Eu Cu 202 8 33 16 67 930 3 77 344 2.53 3.01 35 26.74 87 5 2 2

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