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Does your doctor know? (part 2). The table in Exercise 14 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 14: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.
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.
Find the mean and variance of the average velocity of the particles and what is the probability that the average velocity is ≥ 10-9 cm/sec?
What is the probability that all three are super-commuters?- What is the probability that none of the three are supercommuters?
When we carry out a chi-square test of independence, the expected frequencies are based upon the Null hypothesis - true or false.
Dogs. A census by the county dog control officer found that 18% of homes kept one dog as a pet, 4% had two dogs, and 1% had three or more.
Make a conjecture as to the value of Pn
If you select a random sample of 16 cups and are willing to have an α = 0.05 risk of committing a Type I error, compute the probability of a Type II error (β) if the population mean amount dispensed is actually:
A population of 1000 students spends an average of $10.50 a day on dinner. The standard deviation of the expenditure is $3. A simple random sample of 64 students is taken.
The random variable X has the cumulative distribution function F(x) whose value or derivative F(x) is shown below for various values of x.
Assuming the requirements of ANOVA are satisfied, at the .05 level of significance, is there evidence of a significant difference among the mean wait times at the five checkpoints?
A survey conducted by the Consumer Reports National Research Center reported, among other things, that women spend an average of 1.2 hours per week shopping.
What is the right tail percentile required to reject the null hypothesis?
Body temperatures. Most people think that the normal adult body temperature is That figure, based on a 19th-century study, has recently been challenged.
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