Thread: Statistics: Hypothesis Testing Q

I'm confused on how I should go about creating the hypothesis for the population. Lets say there are n = 5 people and they are tested to see how long their nails are. These values are z scores (I made these values up and it's in cm): 1.30, 2.25, 2.60, 1.10, and 3.05. My z-critical will be p<0.05 on a two tail.

By this data, I reject the null hypothesis because most of them are above 1.96. But how would I do this calculation using the formula:
mean - hypothesized population mean / standard error?

I don't understand how to obtain the mean, standard deviation, and I'm not sure what I should hypothesize for the population mean. Someone please show me step by step on how to solve this. Thank you.

Originally Posted by Catdaddy

I'm confused on how I should go about creating the hypothesis for the population. Lets say there are n = 5 people and they are tested to see how long their nails are. These values are z scores (I made these values up and it's in cm): 1.30, 2.25, 2.60, 1.10, and 3.05. My z-critical will be p<0.05 on a two tail.

By this data, I reject the null hypothesis because most of them are above 1.96. But how would I do this calculation using the formula:
mean - hypothesized population mean / standard error?

I don't understand how to obtain the mean, standard deviation, and I'm not sure what I should hypothesize for the population mean. Someone please show me step by step on how to solve this. Thank you.

Please type the exact question.

CB

I'm sorry there is no question, it's just a graph with nail sizes. I don't get how I'm supposed to obtain these values with just this information. Am I missing something here?

Originally Posted by Catdaddy

I'm sorry there is no question, it's just a graph with nail sizes. I don't get how I'm supposed to obtain these values with just this information. Am I missing something here?

OK ... then what are you trying to do? Why do you want to do some kind of test on this data ...

CB