Problem 4

Use the following information to write the corresponding null and alternative hypothesis:

a.A sample mean of 23 is statistically different from a population mean of 30

b.A sample mean of 56 is less than the population mean of 70

c.A sample mean of 75 is greater than the population mean of 70

Be sure to show the relationship!

Problem 3

I have finished analyzing the data from a recent study.

There are 25 subjects in the sample

The mean of the sample is 75

The standard deviation is 4.7

Please answer the following:

a.What is the standard error 0 the mean for these data?

b.What are the 95% and 99% confidence intervals

c.What is the probability of obtaining by chance the following:

i.A mean less than 72

ii.A mean less than 74

iii.A mean less than 76

iv.A mean less than 78