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

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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

math Statistics-And-Probability

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Answer 1

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 5 o. 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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Answer 2

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