Saturday

April 19, 2014

April 19, 2014

Posted by **georgia** on Saturday, May 29, 2010 at 5:35pm.

- statistics -
**MathGuru**, Sunday, May 30, 2010 at 8:52amI'll give you a few hints. Try a two-sample z-test on this data since the sample sizes are fairly large. In symbolic form, the null hypothesis would state the population means are equal and the alternate hypothesis would state the populations are not equal. If the null is rejected in favor of the alternate hypothesis at .04 level of significance (you can determine the cutoff or critical z to reject the null from a z-table), you can then conclude a difference in the population.

- statistics -
**Jason**, Sunday, May 30, 2010 at 10:31pmEvolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking-even if they are not exposed to the usual pattern of sunlight. To test this notion, eight paid volunteers were place (individually) in a room in which there was no light from the outside and no clocks or other indications of time. They could turn the lights on and off as they wished. After one month in the room, each individual tended to develop a steady cycle. Their cycles at the end of the study were as follows: 25, 27, 25, 23, 24, 25, 26, and 25.

**Related Questions**

statistics - A sample of 40 observations is selected from one approximately ...

statistics - 7. A sample of 40 observations is selected from one population. The...

Statistics - 8. A sample of 65 observations is selected from one population. The...

stats - A sample of 12 observations is selected from a normal population for ...

statistics - The scores of students on the ACT college entrance examination in ...

Statistics - . A random sample is selected from a normal population with a mean ...

Statistics - he Oil Price Information Center reports the mean price per gallon ...

gre math prob of a sample - sample standard deviation = 3 sample mean = 68 n=30 ...

Statistics - For a population with a mean of (mew) = 50 and a standard deviation...

Probabilty & Statistic - A random sample is selected from a normal population ...