How many degrees of freedom are there

Reference no: EM131426838

Does your doctor know? The table in given Exercise shows whether NEJM medical articles during various time periods included statistics or not. We're planning to do a chi-square test.

a) How many degrees of freedom are there?

b) The smallest expected count will be in the 1989/No cell. What is it?

c) Check the assumptions and conditions for inference.

Exercise :
Does your doctor know? A survey7 of articles from the New England Journal of Medicine (NEJM) classified them according to the principal statistics methods used. The articles recorded were all non-editorial articles appearing during the indicated years. Let's just look at whether these articles used statistics at all.

	Publication Year
	1978-79	1989	2004-05	Total
No stats	90	14	40	144
Stats	242	101	271	614
Total	332	115	311	758

Has there been a change in the use of Statistics over the decades?

a) What kind of test would be appropriate?

b) State the null and alternative hypotheses.

Reference no: EM131426838

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