Homework Answers

A survey of 100 similar-sized hospitals revealed a mean daily census in

the pediatrics service of 27

with a standard deviation of 6.5. Do these data provide sufficient evidence to

indicate that the

1. population mean is greater than 25? Let alpha = 0.5

We wish to know if we can conclude that the mean daily caloric intake in

the adult rural population of

a developing country is less than 2000. A sample of 500 had a mean of 1985

and a standard deviation

of 210. Let alpha = 0.5

A sample of 25 freshman nursing students made a mean score of 77 on a

test designed to measure

attitude toward the dying patient. The sample standard deviation was 10. Do

these data provide

sufficient evidence to indicate, at the .05 level of significance, that the

population mean is less than

80? What assumptions are necessary?

Nine laboratory animals were infected with a certain bacterium and then

immunosuppressed. The

mean number of organisms later recovered from tissue specimens was 6.5

(coded data) with a

standard deviation of .6. Can one conclude from these data that the

population mean is greater than 6?

Let alpha = 0.5What assumptions are necessary?

In a sample of 49 adolescents who served as the subjects in an

immunologic study, one variable of

interest was the diameter of skin test reaction to an antigen. The sample mean

and standard deviation

were 21 and 11mm erythema, respectively. Can it be concluded from these

data that the population

mean is less than 30? Let alpha = 0.5