# Population Mean Assignment | Professional Writing Services

Problem 4

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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

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

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