This is meant to be answer in R. There are two questions. 2.From the previous qu

Question

This is meant to be answer in R. There are two questions.

2.From the previous question, what is the expected value of cell (1,1) (Heavy & [,1])?  (up to three decimal places, please)

Dataset survey in MASS package contains the responses of 237 Statistics students at the University of Adelaide to a number of questions. One tested if how much the student smokes (smoke) and how often the student exercises (exer) are independent using chi-sq test. The result, however, got a warning message: In chisq.test(tbl): Chi-squared approximation may be incorrect. So, 'none' and 'some' categories in 'exer' variable are combined. the following table is the reallocated data: Heavy Never Occas Regul Report the test statistic using the table above. (up to three decimal places, please) 7 87 12 4 102 7 8

Explanation / Answer

The statistical software output for this problem is:

Contingency table results:
Rows: var14
Columns: None

Chi-Square test:

Hence,

1. Test statistic = 3.233

2. Expected count for cell [1, 1] = (11*115)/236 = 5.360

[.1] [.2] Total Heavy 7 4 11 Never 87 102 189 Occas 12 7 19 Regul 9 8 17 Total 115 121 236

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